GTA
Air gun Entertainment and reviews => Hajimoto Productions => Topic started by: Richard3589 on June 03, 2022, 10:28:37 PM
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Is there a simple upgrade i can do to get a little more power out of my .22 Marauder rifle that Hajimoto would recommend ? Not trying to get into the guts of the air rifle. Thanks
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Is there a simple upgrade i can do to get a little more power out of my .22 Marauder rifle that Hajimoto would recommend ? Not trying to get into the guts of the air rifle. Thanks
So talk to me about what you have tried already and help me understand what it is that you are trying to achieve.
I ask because the non field target version of Marauder is an unregulated PCP and it offers a fair amount of adjustability so I like to hear what bridges you've crossed to better help me understand your situation.
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What fpe range are you wanting? There are a lot of little mods and upgrades out there to get it shooting hotter.
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Is there a simple upgrade i can do to get a little more power out of my .22 Marauder rifle that Hajimoto would recommend ? Not trying to get into the guts of the air rifle. Thanks
So talk to me about what you have tried already and help me understand what it is that you are trying to achieve.
I ask because the non field target version of Marauder is an unregulated PCP and it offers a fair amount of adjustability so I like to hear what bridges you've crossed to better help me understand your situation.
I haven't tried a lot cause I don't own a chronograph and I'm very new to PCPs. The phone app ui found sais I'm shooting around 780 fps with 18.13 Barracuda 18s, stringing between 770 and 788 but Im not sure how accurate that is. I'm using it for medium size pesting up to raccoon size or to 60 yds or so. I was thinking about giving the transfer port 1 full turn out,leaving the Hammer at factory settings. I. Trying to get it to around 850-900 fps using 18.13 or up to 22 gr pellets. I'm very new to all of this and honestly haven't tried much. Don't want to screw my rifle up. Basically starting from the beginning. It is a very accurate rifle for the most part.
Hope no one thinks I'm a idiot. Lol
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What fpe range are you wanting? There are a lot of little mods and upgrades out there to get it shooting hotter.
Wanting around 850 or so.
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First I would try adding some hammer spring tension, if you are still not getting the speeds you want, open the transfer adjustment screw a little. Count and jot down your turns for reference.
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Fill to 3000psi.
Open the VS to 4 turns CCW.
Replace blocking screw.
Turn HT (1/8”) full CCW.
Then turn HT (1/4”) full CW 6 turns.
That is the maximum power you will get from your rifle.
You will probably b wasting air as the hammer bumps up against the poppet after each shot.
You can add bStaley to correct that.
But those settings should get you real close to 900fps with 14.3.
If too much, you can reduce HT (1/8”) by turning CW or reducing HS (1/4”) by turning CW.
When you get close to the results you are after you can increase efficiency a bit by closing (CW) the VS a turn or two.
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Following along. You need to get a chronograph so you know exactly what is happening with each adjustment. Record the results for later on if you need it. The b-staley mod is a pretty good one.
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A chronograph is essential to know what you're adjustments are doing. How else will you know what direction you're headed? Here's a guide. https://docs.google.com/document/d/1WFDife1EqVkkDQPEwRZFU6Kawki2sCi0x5KdFarO86U/edit?hl=en_US
I'd be interested to know what phone app works as a chronograph by itself.
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A chronograph is essential to know what you're adjustments are doing. How else will you know what direction you're headed? Here's a guide. https://docs.google.com/document/d/1WFDife1EqVkkDQPEwRZFU6Kawki2sCi0x5KdFarO86U/edit?hl=en_US
I'd be interested to know what phone app works as a chronograph by itself.
It's called Chrono connect mobile.
I know a Chrono is vital, but I can't afford one right now. At least, not a Caldwell.
I would think you could tell speed wise by how and where you got at said distance but I get it chronograph is in the future.
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Fill to 3000psi.
Open the VS to 4 turns CCW.
Replace blocking screw.
Turn HT (1/8”) full CCW.
Then turn HT (1/4”) full CW 6 turns.
That is the maximum power you will get from your rifle.
You will probably b wasting air as the hammer bumps up against the poppet after each shot.
You can add bStaley to correct that.
But those settings should get you real close to 900fps with 14.3.
If too much, you can reduce HT (1/8”) by turning CW or reducing HS (1/4”) by turning CW.
When you get close to the results you are after you can increase efficiency a bit by closing (CW) the VS a turn or two.
What is a b Staley?
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Should I send this kid a chronograph?
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He needs one for sure if he starts trying to tune. That would be very kind of you Frank.
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I only have 4.
So if he wants the Shooting Chrony he can send me a PM.
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He needs one for sure if he starts trying to tune. That would be very kind of you Frank.
Don’t spread that around.
To most people I am a POS.
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I've been using this Chrono Connect app.
I put one turn in my Hammer spring and it read these numbers. Three different 10 shot strings. 2 we're around 2900 psi fill and last one was at around 2700 psi start. 2700 fill is the one that sais 802 on the picture. Not sure how close this is, but it's a start I guess.
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Shooting Chrony is packed and shipping label attached.
In the mail tomorrow, Priority Mail.
Probably Thursday to Arkansas country..
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Richard when you start a string the first number will be the lowest.
The pressure in the air tube is stronger than the hammer strike so the poppet closes fast cutting off the air.
As the pressure in the air tube lessens the poppet does not close as fast so more air is used and the speed slowly rises.
Then as the air continues to be used the speed will lower again.
(A bell curve)
You are looking to make that curve as flat as possible.
You want to keep track, as much as possible, of the air pressure on your gauge at each shot.
Record the pressure with each shot.
Then you will know at what pressure you want to fill the rifle so that you begin at your chosen speed.
Do a search on Google for “A” Team Marauder tuning.
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Thank you. I will definitely start jotting down my shot counts. Thanks again
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Have fun Richard. Thanks Frank I love witnessing random acts of kindness.
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One hint I might offer on tuning a non regulated gun. Don't make your adjustments based on the numbers from a shot or 2. Make your adjustments based on a full shot string. You're looking for the lowest possible standard deviation bell curve string.
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Chrony left Oakland last night.
Probably in OKC by now.
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Little Rock now.
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I hadn't had time to check. Lower back causing some involuntary muscle issues. Spent all all day in the ER yesterday.
Thanks again sir, I appreciate it 100%
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Hope you get better soon Richard.
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Hope you get better soon Richard.
Thank you
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Delivered..
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Back pain is NO joke. Have fun tuning your marauder Richard.
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Thanks
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Hope you get better soon Richard.
I'm quite well, thank you.
Oh, it's another Richard ;D
Seriously, enjoy your chrony, Richard!
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Hope you get better soon Richard.
I'm quite well, thank you.
Oh, it's another Richard ;D
Seriously, enjoy your chrony, Richard!
Thanks sir, I shot my first 3 strings today with it. Was going to take pics of the pages and share them here for y'all to see. I can see me digging this even more. Adding to the addiction I guess. Lol
Is there of place for sharing that stuff or I'd here fine?
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Hope you get better soon Richard.
I'm quite well, thank you.
Oh, it's another Richard ;D
Seriously, enjoy your chrony, Richard!
Thanks sir, I shot my first 3 strings today with it. Was going to take pics of the pages and share them here for y'all to see. I can see me digging this even more. Adding to the addiction I guess. Lol
Is there of place for sharing that stuff or I'd here fine?
I'd post it here so that everyone would witness the progression of this thread (and your rifle) ;D
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My first minor adjustment tries and use of the Chrono Fairfield sent me. First string was how it was set, second string was 1 1/2 turns in on Hammer spring and third was 1/2' back out. Third string had a few errors thrown then I pulled the cloud shields cause it was starting to get dark and they stopped. All adjustments were just hammer spring so far. Thinking about opening the transfer port 1 turn next time and see what it does. Got a lot of learning to do.
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That first string looks great... even better if you drop that last shot.
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Keep up the testing.
Now I only have three chronographs.
The one in the middle is a chrono/timer.
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Keep up the testing.
Now I only have three chronographs.
The one in the middle is a chino/timer.
The one on the right looks like a cash register ;D
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Built-in printer
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Update!!!
So today I tinker a little more and ran 2more strings. I like the 5th one better for now So I took the transfer port and bottomed it and came out 3 turns for string 4 and 2.5 for string 5. Both had good standard deviation and spread from what I've read. It was all transfer port this time and left the Hammer spring were I had it set in the 3rd string. I'm starting to understand the infatuation with tuning. Lol. Around 850 average seems about right for now. Want to keep that or a little faster, but with maybe a couple more shots around that 840 to 850 or better ps.
Shot some Barracuda 21.14 and a couple Griffin Hollow base HP 18 gr. Both shot almost the exact same FPS are around 2900 psi fill spot shooting 798 and 797. I though the slugs would shoot faster than my 18.13s but I was wrong. A lot more adjustments to try ,but I'm gonna leave alone for a week or 2 and see how it settles in.
Thanks
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Looks pretty good.
Richard Diablo designed pellets shoot their best at around 850fps.
You are right there.
When you are shooting does it sound like the rifle is burping, e.g., using air as the hammer bounces off of the poppet?
If so there are techniques and additions that can stop that.
Keep searching.
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My hearing is not the greatest so I may not notice it. Just the slight ping of the shot all I notice.
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I agree with Frank. Shoot the gun and let everything settle in and do some more research. There are ways to squeeze more out of it. I have regs in all mine except my aea 30 challenger and I left it set from the factory.
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Thanks guys for all the insight . Gonna leave it and shoot it for a little while, then check it again.
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Did some more Chrono work yesterday in the yard. Was a little windy, and I'm not sure how that effects number but after shooting a few through it , it seems to have settled in around 810 fps now. Tank doesnt leak down either. The only thing I added was that Archers Airguns Marauder tune kit bolt. Could a windy day effect my Chrono? I'm guessing so. Lol
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I'd be interested to know what phone app works as a chronograph by itself.
Apparently you tell it how far away the target it, then it "listens" for the report, then listens for the impact on target. then works out the FPS.
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I'd be interested to know what phone app works as a chronograph by itself.
Apparently you tell it how far away the target it, then it "listens" for the report, then listens for the impact on target. then works out the FPS.
Dan,
If in fact that is how it works, that is the DOPPLER effect.
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Hey Richard, welcome to the family. Once you become more familiar with you rifle, there are some added trick that will increase you shot count, but limits you hammer tuning. I have a few marauder rigs that are TACK DRIVERS well beyond the average pcp. Most of the information can be found here and shared by the M-rod family. Here are a few ideas, these are all slug pushers now.
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Update!!!
So today I tinker a little more and ran 2more strings. I like the 5th one better for now So I took the transfer port and bottomed it and came out 3 turns for string 4 and 2.5 for string 5. Both had good standard deviation and spread from what I've read. It was all transfer port this time and left the Hammer spring were I had it set in the 3rd string. I'm starting to understand the infatuation with tuning. Lol. Around 850 average seems about right for now. Want to keep that or a little faster, but with maybe a couple more shots around that 840 to 850 or better ps.
Shot some Barracuda 21.14 and a couple Griffin Hollow base HP 18 gr. Both shot almost the exact same FPS are around 2900 psi fill spot shooting 798 and 797. I though the slugs would shoot faster than my 18.13s but I was wrong. A lot more adjustments to try ,but I'm gonna leave alone for a week or 2 and see how it settles in.
Thanks
I have been following along. I just wanted to stop by and say how impressed I am with your tuning progress. I have messed with tuning my marauders quite a bit over the years, so I know when I see good tuning work on them. I really like the 30 FPE tune and that both tunes are within a 2% ES with good efficiency numbers. You can get more shots with a higher ES, but I would stop while you're ahead. Again, great effort!
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Update!!!
So today I tinker a little more and ran 2more strings. I like the 5th one better for now So I took the transfer port and bottomed it and came out 3 turns for string 4 and 2.5 for string 5. Both had good standard deviation and spread from what I've read. It was all transfer port this time and left the Hammer spring were I had it set in the 3rd string. I'm starting to understand the infatuation with tuning. Lol. Around 850 average seems about right for now. Want to keep that or a little faster, but with maybe a couple more shots around that 840 to 850 or better ps.
Shot some Barracuda 21.14 and a couple Griffin Hollow base HP 18 gr. Both shot almost the exact same FPS are around 2900 psi fill spot shooting 798 and 797. I though the slugs would shoot faster than my 18.13s but I was wrong. A lot more adjustments to try ,but I'm gonna leave alone for a week or 2 and see how it settles in.
Thanks
I have been following along. I just wanted to stop by and say how impressed I am with your tuning progress. I have messed with tuning my marauders quite a bit over the years, so I know when I see good tuning work on them. I really like the 30 FPE tune and that both tunes are within a 2% ES with good efficiency numbers. You can get more shots with a higher ES, but I would stop while you're ahead. Again, great effort!
Thank you sir. I'm still learning. After shooting a few more times it settled in around 820 fps Average. May add a turn at the Hammer spring and see if that gets me back around 840. My goal is to hit around 820 with a 21.14 or so pellet. That's were the 18.13s are now.
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Update!!!
So today I tinker a little more and ran 2more strings. I like the 5th one better for now So I took the transfer port and bottomed it and came out 3 turns for string 4 and 2.5 for string 5. Both had good standard deviation and spread from what I've read. It was all transfer port this time and left the Hammer spring were I had it set in the 3rd string. I'm starting to understand the infatuation with tuning. Lol. Around 850 average seems about right for now. Want to keep that or a little faster, but with maybe a couple more shots around that 840 to 850 or better ps.
Shot some Barracuda 21.14 and a couple Griffin Hollow base HP 18 gr. Both shot almost the exact same FPS are around 2900 psi fill spot shooting 798 and 797. I though the slugs would shoot faster than my 18.13s but I was wrong. A lot more adjustments to try ,but I'm gonna leave alone for a week or 2 and see how it settles in.
Thanks
I have been following along. I just wanted to stop by and say how impressed I am with your tuning progress. I have messed with tuning my marauders quite a bit over the years, so I know when I see good tuning work on them. I really like the 30 FPE tune and that both tunes are within a 2% ES with good efficiency numbers. You can get more shots with a higher ES, but I would stop while you're ahead. Again, great effort!
Thank you sir. I'm still learning. After shooting a few more times it settled in around 820 fps Average. May add a turn at the Hammer spring and see if that gets me back around 840. My goal is to hit around 820 with a 21.14 or so pellet. That's were the 18.13s are now.
I haven't done much with the H&N heavies in a while since my aftermarket barrel doesn't like them. This is about the most I have ever pushed them. They did shoot the best in 5.53 head diameters when using the stock barrel.
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Update!!!
So today I tinker a little more and ran 2more strings. I like the 5th one better for now So I took the transfer port and bottomed it and came out 3 turns for string 4 and 2.5 for string 5. Both had good standard deviation and spread from what I've read. It was all transfer port this time and left the Hammer spring were I had it set in the 3rd string. I'm starting to understand the infatuation with tuning. Lol. Around 850 average seems about right for now. Want to keep that or a little faster, but with maybe a couple more shots around that 840 to 850 or better ps.
Shot some Barracuda 21.14 and a couple Griffin Hollow base HP 18 gr. Both shot almost the exact same FPS are around 2900 psi fill spot shooting 798 and 797. I though the slugs would shoot faster than my 18.13s but I was wrong. A lot more adjustments to try ,but I'm gonna leave alone for a week or 2 and see how it settles in.
Thanks
I have been following along. I just wanted to stop by and say how impressed I am with your tuning progress. I have messed with tuning my marauders quite a bit over the years, so I know when I see good tuning work on them. I really like the 30 FPE tune and that both tunes are within a 2% ES with good efficiency numbers. You can get more shots with a higher ES, but I would stop while you're ahead. Again, great effort!
Thank you sir. I'm still learning. After shooting a few more times it settled in around 820 fps Average. May add a turn at the Hammer spring and see if that gets me back around 840. My goal is to hit around 820 with a 21.14 or so pellet. That's were the 18.13s are now.
I haven't done much with the H&N heavies in a while since my aftermarket barrel doesn't like them. This is about the most I have ever pushed them. They did shoot the best in 5.53 head diameters when using the stock barrel.
Did you have transfer port all the way open and hammer spring bottomed out to get those numbers?
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Update!!!
So today I tinker a little more and ran 2more strings. I like the 5th one better for now So I took the transfer port and bottomed it and came out 3 turns for string 4 and 2.5 for string 5. Both had good standard deviation and spread from what I've read. It was all transfer port this time and left the Hammer spring were I had it set in the 3rd string. I'm starting to understand the infatuation with tuning. Lol. Around 850 average seems about right for now. Want to keep that or a little faster, but with maybe a couple more shots around that 840 to 850 or better ps.
Shot some Barracuda 21.14 and a couple Griffin Hollow base HP 18 gr. Both shot almost the exact same FPS are around 2900 psi fill spot shooting 798 and 797. I though the slugs would shoot faster than my 18.13s but I was wrong. A lot more adjustments to try ,but I'm gonna leave alone for a week or 2 and see how it settles in.
Thanks
I have been following along. I just wanted to stop by and say how impressed I am with your tuning progress. I have messed with tuning my marauders quite a bit over the years, so I know when I see good tuning work on them. I really like the 30 FPE tune and that both tunes are within a 2% ES with good efficiency numbers. You can get more shots with a higher ES, but I would stop while you're ahead. Again, great effort!
What app did you use for this chart?
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Update!!!
So today I tinker a little more and ran 2more strings. I like the 5th one better for now So I took the transfer port and bottomed it and came out 3 turns for string 4 and 2.5 for string 5. Both had good standard deviation and spread from what I've read. It was all transfer port this time and left the Hammer spring were I had it set in the 3rd string. I'm starting to understand the infatuation with tuning. Lol. Around 850 average seems about right for now. Want to keep that or a little faster, but with maybe a couple more shots around that 840 to 850 or better ps.
Shot some Barracuda 21.14 and a couple Griffin Hollow base HP 18 gr. Both shot almost the exact same FPS are around 2900 psi fill spot shooting 798 and 797. I though the slugs would shoot faster than my 18.13s but I was wrong. A lot more adjustments to try ,but I'm gonna leave alone for a week or 2 and see how it settles in.
Thanks
I have been following along. I just wanted to stop by and say how impressed I am with your tuning progress. I have messed with tuning my marauders quite a bit over the years, so I know when I see good tuning work on them. I really like the 30 FPE tune and that both tunes are within a 2% ES with good efficiency numbers. You can get more shots with a higher ES, but I would stop while you're ahead. Again, great effort!
What app did you use for this chart?
This is my personal app, but you can download a very similar app I am sharing on here along with a video tutorial to help you get started with it. You'll need a Windows based PC and Excel to use it though.
Here's a link to the page:
https://www.gatewaytoairguns.org/GTA/index.php?topic=146784.msg155910719#msg155910719 (https://www.gatewaytoairguns.org/GTA/index.php?topic=146784.msg155910719#msg155910719)
To answer your other questions...Yes, VMS was set to 5.5 turns out (wide open). I was also using some mods I created i.e., the "DIY SSG" and the "F.A.M.E. mod". You can search for those terms and see the full write up and instructions on how to build or to use them together. See the notes in the app for the mods and settings used in that H&N string which might help you more.
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That is a solid 25 shots for sure. More than enough to hunt or pest with.
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Do any of y'all know the twist rate on a .22 Marauder and how to tell the difference between a Lothar Barrel or Crosman?
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Do any of y'all know the twist rate on a .22 Marauder and how to tell the difference between a Lothar Barrel or Crosman?
Crosman said 1:20 twist on .22 Marauder
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Here's my latest spread using a different pellet for 32 shots. Then tried a few in 5 shot strings just cause. Ohh and Griffin Hollow base Hollow points 20 gr avg 760 fps . Hope y'all are enjoying my growth. Lol
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It's a lot of fun tuning a gun. Next step custom/upgraded mods. LOL. I'm surprised Crosman uses a 1:20 twist. I always thought the factory barrels were somewhere around 1:18 TR. Keep up the good work, it's refreshing to see someone get fired up in the Marauder / Armada platform. I love mine for sure.
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Thanks Bear Air.
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I do not have hardly any experience with many other airguns other than my marauders and armadas. Just shot my 357 armada today since I had to take it apart and put some loctite on the bolt/bolt. It was lose and I'm not playing with any type of safety issues when it comes to that gun. 81gr FX pellet from 900ish to 860's over 5-6 shots. Jump down the rabbit hole it's nice down here lol. I would love for C/B make a retrofit sidelever for the gen 2 platform. I would have to buy at least a couple
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I do not have hardly any experience with many other airguns other than my marauders and armadas. Just shot my 357 armada today since I had to take it apart and put some loctite on the bolt/bolt. It was lose and I'm not playing with any type of safety issues when it comes to that gun. 81gr FX pellet from 900ish to 860's over 5-6 shots. Jump down the rabbit hole it's nice down here lol. I would love for C/B make a retrofit sidelever for the gen 2 platform. I would have to buy at least a couple
The side lever is a good idea. I think JSAR made one at one time. The cocking bolt does get a little stiff after a few shots (probably because I'm worn out. Lol) So far I like it a lot. Actually thought about getting the .25 cal one next but who knows.
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My first PCP rifle was a 25cal Armada. It had the GM barrel. I ended up get a barrel from Jim Gaska for it. The GM barrel was very accurate. I sold it without even knowing what I had. It went to a good home though. I think the newer style 25 barrels are very good too though.
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I may find out one day. Right now I'm really enjoying my .22 Marauder. I also have a couple springers. One in . 22 and one in .25. I usually shoot the 50 ft casual on here with my Hatsan 95 .22. lately I've just been concentrating on fine tuning the Synrod. Getting close every day without many extra upgrades. I'm still afraid to mess with internals much, so port and hammer adjustments have mainly been it. Still have room in the port but don't want to open wide open. It might start burping air then, but I don't know. Like I said , I'm pretty green on PCPs.
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I got a .25 Marauder in Nov 2020 but it sat collecting dust until last month because it leaked so badly and getting service during COVID was difficult. Now after a warranty repair it holds its charge super well.
I've wanted to get it launching the 34-grain JSBs at 850fps, 55fpe, but I've been trying the different tuning methods I found online and there doesn't seem to be any combination of adjustments that will get me more than about 800fps (48.5fpe). I've looked all over this GTA forum, but trying to find information here is kind of like trying to drink from a fire hose. I was on the more-focused Marauder forum in its dying days, but it's gone now. Can someone suggest some good resources?
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I got a .25 Marauder in Nov 2020 but it sat collecting dust until last month because it leaked so badly and getting service during COVID was difficult. Now after a warranty repair it holds its charge super well.
I've wanted to get it launching the 34-grain JSBs at 850fps, 55fpe, but I've been trying the different tuning methods I found online and there doesn't seem to be any combination of adjustments that will get me more than about 800fps (48.5fpe). I've looked all over this GTA forum, but trying to find information here is kind of like trying to drink from a fire hose. I was on the more-focused Marauder forum in its dying days, but it's gone now. Can someone suggest some good resources?
The information you are looking for is on here, you just need to master the search feature. Go to advanced (https://www.gatewaytoairguns.org/GTA/index.php?action=search;advanced;search=) and you narrow down the scope of your search.
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Well, Hajimoto, I think highly of you, but I have spent dozens of hours of searching and reading topics about Marauder tuning and it's not getting me there. I was hoping that someone would remember a particularly helpful thread. Sometimes someone's memory is a lot better than a search function that lacks human intelligence.
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Well, Hajimoto, I think highly of you, but I have spent dozens of hours of searching and reading topics about Marauder tuning and it's not getting me there. I was hoping that someone would remember a particularly helpful thread. Sometimes someone's memory is a lot better than a search function that lacks human intelligence.
I understand completely. I built a few Marauders and I can tell you that in order to get a .25 caliber to 55fpe you will need to modify the Marauder to some degree. Modification variables are hammer, hammer spring, barrel transfer port opening, and valve work.
Here are some things to consider which will also help you GOOGLE any one of them for more specifics regarding that topic
- Start with replacing the hammer spring with a 10# spring.
- Make sure your valve metering screw is back all the way out as described in your owner's manual.
- Open up barrel transfer port to 3/16" (0.1875)
- Replace the transfer tube with a larger ID port for greater airflow.
- Increase Valve exhaust port ID
- Increase Valve Throat ID
Here is an oldy but a goodie from Bullfrog. When you watch this video you will learn a lot about what it takes to extract greater power out of your Marauder
https://www.youtube.com/watch?v=q2DRKNzWB3I (https://www.youtube.com/watch?v=q2DRKNzWB3I)
I hope this helps
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In ADVANCED search ... You can also add a Specific Poster / Member and then keyword MARAUDER and get the most bang for your search buck 8)
I had done LOTS of marauder mod posts here 7-10 years ago. Search member MOTORHEAD to find them.
There were Many of us years back that did extensive work on that platform, sadly the member names escape me now ???
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I got a .25 Marauder in Nov 2020 but it sat collecting dust until last month because it leaked so badly and getting service during COVID was difficult. Now after a warranty repair it holds its charge super well.
I've wanted to get it launching the 34-grain JSBs at 850fps, 55fpe, but I've been trying the different tuning methods I found online and there doesn't seem to be any combination of adjustments that will get me more than about 800fps (48.5fpe). I've looked all over this GTA forum, but trying to find information here is kind of like trying to drink from a fire hose. I was on the more-focused Marauder forum in its dying days, but it's gone now. Can someone suggest some good resources?
You are only going to have 55fpe at the muzzle…maybe.
The energy bleeds off very fast (Check ChairGun).
My .25 shoots @ 40fpe and has dropped every mammal it has shot at with one shot.
Just get a nice tune and then get closer.
I was an archer in my earlier days and still shoot a muzzle-loader (in addition to the 499b) so getting close is normal for me.
Too, I have harvested (politically correct term) four Pronghorn antelope and not one of them was more than 75 yards away.
Enjoy the hunt.
Get close.
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My armada shoots the hades around 880 fps which is around 43 fpe or so and I agree with Frank about that being plenty of power. 50 yards no prob. Your still dropping 30 fpe out at 50 yards I imagine. There's programs out there that figure that crazy stuff out.
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Thanks everyone. I expect to be able to work on it more this week. I will probably go for a stronger hammer spring if I can find the right thing to order; but I don't think I want to go crazy with the modifications since I'm not too far from the goal.
My armada shoots the hades around 880 fps which is around 43 fpe or so and I agree with Frank about that being plenty of power. 50 yards no prob. Your [You're, contraction of "you are"] still dropping 30 fpe out at 50 yards I imagine. There's programs out there that figure that crazy stuff out.
Hard Air Magazine's test of this pellet says in the article at https://hardairmagazine.com/reviews/jsb-exact-king-heavy-mkii-33-95-grain-25-caliber-pellet-test-review/, "As Chairgun shows, no less than 73% of the Muzzle Energy is retained by JSB Exact King Heavy MkII 33.95 Grain .25 caliber pellets even at 60 Yards range."
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Hey everyone,went out the other day in 103 degree temps and did some Chrono work with my Marauder .22, so these numbers may be a little higher than normal temps. Not sure how that works. Anyways,shot multiple pellets and one Griffin slug near the peak of the shot curve. Seems to be between 2700 and 2000 psi. These were done at the peak around 2600 fps.
17.6 Norma = 874.6
18.13 jsb = 854.9
21.14 H&N = 814.3
25.43 Jsb jumbo = 733.7
14.3 Jsb dome = 976.2
19gr Griffin HBHP = 814.4
Seemed like good numbers. Just thought I would share.
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Following along, this thread has a wealth of knowledge around mods I'm also looking to do, thank you!