GTA

All Springer/NP/PCP Air Gun Discussion General => PCP/CO2/HPA Air Gun Gates "The Darkside" => Topic started by: Harpoon1 on May 09, 2018, 02:10:54 PM

Title: New Convert with .25 Marauder Questions
Post by: Harpoon1 on May 09, 2018, 02:10:54 PM
First PCP, trying to get up to speed, learn the lingo, walk the talk!

Getting a new .25 SynRod and need some hand holding.

I would like to throttle it back some, down to 30 FPE or so, for backyard use. Think 30 fpe is enough power and more importantly, want it as quiet as possible. Next on the list is consistency of power and low ES/SD.

So, with that in mind, Im assuming I'll want a regulator, possibly a Huma? Gauge or No-gauge? And a springand/or hammer kit to tune the power? No idea were to begin there!  8)

Anywhere sell the regulator and spring/hammer kits, for one stop shopping?

Thanks
Title: Re: New Convert with .25 Marauder Questions
Post by: HunterWhite on May 09, 2018, 04:13:20 PM
First of all, good luck with your new rifle.
I also have a 25 synrod. I have read every post on the dark side with Marauder in the title. What I have learned is the very few people regulate 25s. Marauders have 215 cc air tube. A regulated gun requires a small space for the regulated air to feed the valve. This is called the plenum.  If it is too small then the air pressure will drop when the valve is open, resulting in a weak shot. So the regulator, the plenum and the valve use space in the air reservoir.  While this does make the velocity consistent, it also reduces shot count because it reduces air volume in the reservoir.
 Your rifle may work well at 30 fpe. I will be interested to know how this works for you.
Title: Re: New Convert with .25 Marauder Questions
Post by: Kmanca1 on May 09, 2018, 04:25:31 PM
Welcome to the M-rod world!

Yep.  Yep, and yep.   I agree.  A regulator is not the best use of space and air. There's not enough advantages to make it worth adding.

To make it quieter there are are a bunch of EASY tweaks, but here are three quick ones.   
1)  back the power off and tune for a lower fps....which you're already going to do. 
2)  open up the vents on the air stripper. (I almost doubled the size of mine) 
3)  back your metering screw completely out of the air flow.  (4-5 turns out from completely closed)
There are many, many threads, on this site and a couple of others, addressing the possibilities and how-to's, but those 3 quick things will get you going down that proverbial rabbit hole.

Good luck and good shooting!
Title: Re: New Convert with .25 Marauder Questions
Post by: DHunter on May 09, 2018, 05:35:23 PM
Re: New Convert with .25 Marauder Questions

and
Quote
Getting a new .25 SynRod and [...]

I've been here about a month and a half and learned a lot, but I keep seeing these mystery terms.  I get that "Mrod" is the Benjamin Marauder, and "Prod" seems to be the pistol Marauder, but what is "SynRod"?  (I didn't want to clutter the forum with a new topic just for this.)
Title: Re: New Convert with .25 Marauder Questions
Post by: Harpoon1 on May 09, 2018, 05:39:50 PM
Re: New Convert with .25 Marauder Questions

and
Quote
Getting a new .25 SynRod and [...]

I've been here about a month and a half and learned a lot, but I keep seeing these mystery terms.  I get that "Mrod" is the Benjamin Marauder, and "Prod" seems to be the pistol Marauder, but what is "SynRod"?  (I didn't want to clutter the forum with a new topic just for this.)

"Synthetic" stock Marauder.

At least thats what I think it means. And it is what I meant.  8)
Title: Re: New Convert with .25 Marauder Questions
Post by: mobilehomer on May 09, 2018, 05:44:58 PM
Yep, synrod is for a synthetic stock Marauder. This link will prove very useful in the future. There are tons of abbreviations, slang and acronyms.

https://www.gatewaytoairguns.org/GTA/index.php?topic=51866.0 (https://www.gatewaytoairguns.org/GTA/index.php?topic=51866.0)
Title: Re: New Convert with .25 Marauder Questions
Post by: mann on May 09, 2018, 06:50:37 PM
You will love the 25 mrod there are so many mods you can do to them sky's the limit  good luck
Title: Re: New Convert with .25 Marauder Questions
Post by: mann on May 09, 2018, 06:53:19 PM
I have added a ldc it is quiet even at 50 ftlbs
Title: Re: New Convert with .25 Marauder Questions
Post by: DHunter on May 09, 2018, 07:16:28 PM
tons of abbreviations, slang and acronyms  https://www.gatewaytoairguns.org/GTA/index.php?topic=51866.0 (https://www.gatewaytoairguns.org/GTA/index.php?topic=51866.0)

Thankyou!  Very helpful.
Title: Re: New Convert with .25 Marauder Questions
Post by: HunterWhite on May 09, 2018, 08:07:01 PM
BTW L.D.C. means Lead Dust Collector, to avoid the more recognizable term muffler. Yes synrod = synthetic stock marauder.
Title: Re: New Convert with .25 Marauder Questions
Post by: Harpoon1 on May 09, 2018, 08:29:20 PM
I have added a ldc it is quiet even at 50 ftlbs

Definitely want one of those too. Which one do you have and where can I get one?
Title: Re: New Convert with .25 Marauder Questions
Post by: kkarmical on May 09, 2018, 08:33:47 PM
First of all, good luck with your new rifle.
I also have a 25 synrod. I have read every post on the dark side with Marauder in the title. What I have learned is the very few people regulate 25s. Marauders have 215 cc air tube. A regulated gun requires a small space for the regulated air to feed the valve. This is called the plenum.  If it is too small then the air pressure will drop when the valve is open, resulting in a weak shot. So the regulator, the plenum and the valve use space in the air reservoir.  While this does make the velocity consistent, it also reduces shot count because it reduces air volume in the reservoir.
 Your rifle may work well at 30 fpe. I will be interested to know how this works for you.

There are plenty of regulated .25 Mrods out there.  40/40fpe, 24/50fpe, are pretty good shot counts and within reach.
Title: Re: New Convert with .25 Marauder Questions
Post by: HunterWhite on May 09, 2018, 09:20:06 PM
Do you think 45 shots at 30 fpe is possible?
Title: Re: New Convert with .25 Marauder Questions
Post by: mann on May 09, 2018, 09:22:10 PM
Jsar I think is where I got my ldc from
Title: Re: New Convert with .25 Marauder Questions
Post by: mann on May 09, 2018, 09:22:52 PM
Jefferson state air rifles
Title: Re: New Convert with .25 Marauder Questions
Post by: Harpoon1 on May 09, 2018, 09:31:34 PM
Jefferson state air rifles


Yep, awesome, thanks!
Title: Re: New Convert with .25 Marauder Questions
Post by: ShawninIL on May 09, 2018, 10:05:16 PM
Search for Brian's Low Power Tune (BLT) on MarauderAirRifle.com. It gets you 25-30 shot at 800ish fps on a 2500 psi fill, great if you are hand pumping and really quiet.
When I first got mine I set it up this way and had no problem dropping starlings at 65 yards. If you would like to try it I will look for my notes for the settings I used which would get you in the neighborhood.
Also with the .25, you'll find the impact is much louder than the report from the gun.
Title: Re: New Convert with .25 Marauder Questions
Post by: kkarmical on May 09, 2018, 10:54:53 PM
Search for Brian's Low Power Tune (BLT) on MarauderAirRifle.com. It gets you 25-30 shot at 800ish fps on a 2500 psi fill, great if you are hand pumping and really quiet.
When I first got mine I set it up this way and had no problem dropping starlings at 65 yards. If you would like to try it I will look for my notes for the settings I used which would get you in the neighborhood.
Also with the .25, you'll find the impact is much louder than the report from the gun.

Great advise.


http://www.marauderairrifle.com/forum/viewtopic.php?f=24&t=7328 (http://www.marauderairrifle.com/forum/viewtopic.php?f=24&t=7328)
Title: Re: New Convert with .25 Marauder Questions
Post by: FuzzyGrub on May 10, 2018, 09:06:28 AM
Being your first PCP, I would not jump into extensive mods right off the bat.  There is allot to learn.  The oem rifle can be tuned to 30fpe for 24 or more shots.  Also, at this lower power, you may find a LDC is not necessary.  Learn the gun, learn about pcps, figure out what you want to do with it exactly, then start down the modification rabbit hole.

Yes the old adage was that regulation wasn't beneficial on the 25 Mrod.  That barrier has been broken.  Regulation can provide benefit in the 25 cal Mrod, especially if your power level is less than 50fpe.  Many have documented that here on GTA.  It does require other mods, include valve and transfer port, hammers and springs.  This becomes another whole level of tuning and learning.  Not recommending you jump into that end of the pool yet.


Title: Re: New Convert with .25 Marauder Questions
Post by: Harpoon1 on May 10, 2018, 09:38:54 AM
Search for Brian's Low Power Tune (BLT) on MarauderAirRifle.com. It gets you 25-30 shot at 800ish fps on a 2500 psi fill, great if you are hand pumping and really quiet.
When I first got mine I set it up this way and had no problem dropping starlings at 65 yards. If you would like to try it I will look for my notes for the settings I used which would get you in the neighborhood.
Also with the .25, you'll find the impact is much louder than the report from the gun.

Shawn

Thanks dude, didnt know about MarauderAirRifle.com! Good stuff, between MAR.com and Hajimoto's excellent YouTube tutorials, feel like I have a pretty good grip on it now.

Thanks again.
Title: Re: New Convert with .25 Marauder Questions
Post by: Harpoon1 on May 10, 2018, 09:47:46 AM
Being your first PCP, I would not jump into extensive mods right off the bat.  There is allot to learn.  The oem rifle can be tuned to 30fpe for 24 or more shots.  Also, at this lower power, you may find a LDC is not necessary.  Learn the gun, learn about pcps, figure out what you want to do with it exactly, then start down the modification rabbit hole.

Yes the old adage was that regulation wasn't beneficial on the 25 Mrod.  That barrier has been broken.  Regulation can provide benefit in the 25 cal Mrod, especially if your power level is less than 50fpe.  Many have documented that here on GTA.  It does require other mods, include valve and transfer port, hammers and springs.  This becomes another whole level of tuning and learning.  Not recommending you jump into that end of the pool yet.

John

What gun/action is that in your Avatar in the "Blaster" stock, 2nd up from the bottom, in the middle ? Checked the Boyds website and they aren't showing it as being in the inventory anymore! Is it a DIY one off or they dont offer anymore?

Thanks
Title: Re: New Convert with .25 Marauder Questions
Post by: FuzzyGrub on May 10, 2018, 10:52:44 AM

John

What gun/action is that in your Avatar in the "Blaster" stock, 2nd up from the bottom, in the middle ? Checked the Boyds website and they aren't showing it as being in the inventory anymore! Is it a DIY one off or they dont offer anymore?

Thanks

That is a custom, long tube Prod I put together a number of years ago.  It does use a Boyd's Blaster, but it was inletted by Norm, when he owned Discos R US.  That was before Boyd's supported any of the Benjamin air guns.   IMO: the Blaster is one of Boyd's best stocks for a mrod or disco/maximus.   Not sure why they haven't added it to their lineup yet.

Title: Re: New Convert with .25 Marauder Questions
Post by: Harpoon1 on May 10, 2018, 11:44:46 AM

John

What gun/action is that in your Avatar in the "Blaster" stock, 2nd up from the bottom, in the middle ? Checked the Boyds website and they aren't showing it as being in the inventory anymore! Is it a DIY one off or they dont offer anymore?

Thanks


That is a custom, long tube Prod I put together a number of years ago.  It does use a Boyd's Blaster, but it was inletted by Norm, when he owned Discos R US.  That was before Boyd's supported any of the Benjamin air guns.   IMO: the Blaster is one of Boyd's best stocks for a mrod or disco/maximus.   Not sure why they haven't added it to their lineup yet.

Bummer!

I agree, I have a 10/22 in one and its very ergonomic, comfortable, from any position.

Might shoot them an email and see if I (we) can persuade them to add it to the lineup! I much prefer it over their regular thumbhole stock.
Title: Re: New Convert with .25 Marauder Questions
Post by: HunterWhite on May 10, 2018, 12:35:13 PM
Following. Is that the same as the Savage arms 93R17 BTV?
Title: Re: New Convert with .25 Marauder Questions
Post by: moorepower on May 10, 2018, 01:01:36 PM
I ended up stopping at .200 when drilling out the air stripper holes, going in stages. It makes a big differance. The TSS also cut down noise alot by cutting down on wasted air. At this point a QUALITY depinger is in order, as it is loud. The part that is getting left out, is you now need a target backer that absorbs the noise, such as ground up rubber they use for playgrounds and mulch, as the impact report is loud.
Title: Re: New Convert with .25 Marauder Questions
Post by: triggertreat on May 10, 2018, 02:37:25 PM

Being your first PCP, I would not jump into extensive mods right off the bat.  There is allot to learn.  The oem rifle can be tuned to 30fpe for 24 or more shots.  Also, at this lower power, you may find a LDC is not necessary.  Learn the gun, learn about pcps, figure out what you want to do with it exactly, then start down the modification rabbit hole.

Yes the old adage was that regulation wasn't beneficial on the 25 Mrod.  That barrier has been broken.  Regulation can provide benefit in the 25 cal Mrod, especially if your power level is less than 50fpe.  Many have documented that here on GTA.  It does require other mods, include valve and transfer port, hammers and springs.  This becomes another whole level of tuning and learning.  Not recommending you jump into that end of the pool yet.


+1 Great post!
Title: Re: New Convert with .25 Marauder Questions
Post by: FuzzyGrub on May 10, 2018, 02:51:14 PM
I have a 10/22...

Now that you have a 25 synrod that 10/22 will just collect dust.  :D   

I should know, have two heavily modified 10/22's that haven't been shot since getting the pcp bug.   ::)
Title: Re: New Convert with .25 Marauder Questions
Post by: Harpoon1 on May 10, 2018, 03:09:56 PM
Following. Is that the same as the Savage arms 93R17 BTV?

Is what the same? The stock? If so, no. I've got one those too, well, kind of. Its a 93R17 FV-SR in a Boyds thumbhole stock.
Title: Re: New Convert with .25 Marauder Questions
Post by: Harpoon1 on May 10, 2018, 03:23:22 PM
I have a 10/22...

Now that you have a 25 synrod that 10/22 will just collect dust.  :D   

I should know, have two heavily modified 10/22's that haven't been shot since getting the pcp bug.   ::)

"Horses for courses" brother! We shoot the 10/22's out to 300 yds on a regular basis. And I'm knee deep in this 6.5 phenomenon right now, thats the Creedmoor and Grendel versions! Thats on top of shooting 30,000+ rounds through the Springers last year. Something has to give! 8)

Title: Re: New Convert with .25 Marauder Questions
Post by: ShawninIL on May 10, 2018, 10:13:34 PM
Search for Brian's Low Power Tune (BLT) on MarauderAirRifle.com. It gets you 25-30 shot at 800ish fps on a 2500 psi fill, great if you are hand pumping and really quiet.
When I first got mine I set it up this way and had no problem dropping starlings at 65 yards. If you would like to try it I will look for my notes for the settings I used which would get you in the neighborhood.
Also with the .25, you'll find the impact is much louder than the report from the gun.

Shawn

Thanks dude, didnt know about MarauderAirRifle.com! Good stuff, between MAR.com and Hajimoto's excellent YouTube tutorials, feel like I have a pretty good grip on it now.

Thanks again.
No problem. That's the great thing about this hobby, most people are more than willing to help you out and share their knowledge freely. Let me know if I can be of any further assistance.
Title: Re: New Convert with .25 Marauder Questions
Post by: n2omike on May 11, 2018, 10:27:21 AM
I have FOUR Marauders.  Two in .22, and two in .25.
You definitely made the right choice with the .25, as they come with the good Green Mountain barrel.

Completely stock, I tuned mine for 27 shots at 800 fps using 25.4 grain JSB's on a fill.  Excellent accuracy, and more than enough power to hammer birds, squirrels and rabbits.  Gun is also very quiet at this power range.  (I have neighbors all around me)

As for modifications...   I have a .25 that I went all out with...  regulated, big valve, etc, etc, etc.  I also have the above rifle.  Guess which one I shoot the most?  The stock one.  lol  I did make a couple changes recently.  I left everything alone, but added a lighter weight hammer from Rocker1 (member here) and a TSS.  Now, instead of 27 shots at 800 fps, I get close to 40.  Even makes the gun a little quieter, as it's wasting less air. 

If I had it to do all over again, those are the only mods I'd do to any of my Marauders...  except the .22's, as they needed their crappy barrels replaced.  You can get carried away with higher power, but it's still a pellet rifle.  Accuracy and precision are what are key with these guns.  You can build a HAMMER...  and it's still not going to be as powerful as a lowly .22LR.  lol  For anything up to squirrels and rabbits, a stock .25 Marauder is plenty.  If you want to dispatch raccoon sized animals reliably, more power might be nice, but you're still going to want to take head shots.  (aim between the eye and ear) 

Good Luck!
Title: Re: New Convert with .25 Marauder Questions
Post by: Harpoon1 on May 11, 2018, 10:29:41 AM
Search for Brian's Low Power Tune (BLT) on MarauderAirRifle.com. It gets you 25-30 shot at 800ish fps on a 2500 psi fill, great if you are hand pumping and really quiet.
When I first got mine I set it up this way and had no problem dropping starlings at 65 yards. If you would like to try it I will look for my notes for the settings I used which would get you in the neighborhood.
Also with the .25, you'll find the impact is much louder than the report from the gun.

Shawn

Thanks dude, didnt know about MarauderAirRifle.com! Good stuff, between MAR.com and Hajimoto's excellent YouTube tutorials, feel like I have a pretty good grip on it now.

Thanks again.
No problem. That's the great thing about this hobby, most people are more than willing to help you out and share their knowledge freely. Let me know if I can be of any further assistance.

Shawn

Appreciate the offer. I called JSAR yesterday and talked with Travis. "We" came up with a parts list and as soon as they get an item back in stock, I'll place the order and get started. Between getting help here and YouTube, shouldn't be to hard to get it dialed in.

Thanks again.
Title: Re: New Convert with .25 Marauder Questions
Post by: ShawninIL on May 11, 2018, 10:13:50 PM
Travis will get you dialed in fer sure.
Title: Re: New Convert with .25 Marauder Questions
Post by: Thane on May 14, 2018, 06:36:21 AM
I am total novice to this (first post), put an FFH in a totally stock Mrod .25, adjusted the hammer a bit and then put a 43 pellet string all over 30 FPE on a 2,800 psi charge with JSB exact king 25.39.  Started at 740, peaked 789 finished at 730, so the es was wide, but effort was minimal. Also noticeably less noise.

Next I stuck in a Huma reg with gauge port, set to 2,100, adjusted hammer and put out a 36 shot string at 33 FPE within 4% es, even quieter. 30 of the shots within 1% es.

So i feel like I'm rapidly approaching diminishing returns for my purposes. 40 @ 840 would take greater effort/cost... new valve, port ...

Credit to the great people here, it came together quickly,

Thanks guys!

(caught the bug, think I'll start a Hatsan BullBoss .25 because I like to share, but don't like taking turns  ;)...)

Title: Re: New Convert with .25 Marauder Questions
Post by: Harpoon1 on May 14, 2018, 11:25:15 AM
I am total novice to this (first post), put an FFH in a totally stock Mrod .25, adjusted the hammer a bit and then put a 43 pellet string all over 30 FPE on a 2,800 psi charge with JSB exact king 25.39.  Started at 740, peaked 789 finished at 730, so the es was wide, but effort was minimal. Also noticeably less noise.

Next I stuck in a Huma reg with gauge port, set to 2,100, adjusted hammer and put out a 36 shot string at 33 FPE within 4% es, even quieter. 30 of the shots within 1% es.

So i feel like I'm rapidly approaching diminishing returns for my purposes. 40 @ 840 would take greater effort/cost... new valve, port ...

Credit to the great people here, it came together quickly,

Thanks guys!

(caught the bug, think I'll start a Hatsan BullBoss .25 because I like to share, but don't like taking turns  ;)...)

 Nice!

Shot mine Friday for the first time. Shot the JSB 25's very well, no surprise there, and the 30.86 HN Baracuda were almost as good, albeit we only had 25 yds to work with. So far very pleased with the accuracy and even the trigger,  without any adjusting, right out of the box.

We captured the second string/fill using the 30.86 HN's.

Created: 05/11/18 01:04 PM
Description: Mrod .25
Notes 1:
Notes 2:
Distance to Chrono(FT): 4.00
Ballistic Coefficient: 0.021
Bullet Weight(gr): 30.86
Temp: 77 °F
BP: 30.04 inHg
Altitude: 0.00
#          FPS   FT-LBS       PF
26    753      38.86    23.24   
25    762      39.79    23.52   
24    765      40.11    23.61   
23    770      40.63    23.76   
22    777      41.38    23.98   
21    783      42.02    24.16   
20    787      42.45    24.29   
19    789      42.66    24.35   
18    787      42.45    24.29   
17    790      42.77    24.38   
16    792      42.99    24.44   
15    787      42.45    24.29   
14    792      42.99    24.44   
13    791      42.88    24.41   
12    792      42.99    24.44   
11    790      42.77    24.38   
10    791      42.88    24.41   
9     782      41.91    24.13   
8     781      41.80    24.10   
7     789      42.66    24.35   
6     784      42.13    24.19   
5     774      41.06    23.89   
4     776      41.27    23.95   
3     765      40.11    23.61   
2     775      41.16    23.92   
1     766      40.21    23.64   
Average: 780.4 FPS
SD: 11.1 FPS
Min: 753 FPS
Max: 792 FPS
Spread: 39 FPS
Shot/sec: 0.0
True MV: 792 FPS
Group Size (in): 0.00
Title: Re: New Convert with .25 Marauder Questions
Post by: triggertreat on May 14, 2018, 03:25:16 PM

Thanks Skimpy!  I have been wanting someone to post an out of the box .25 cal Mrod tune.  I don't know the fill pressures so I took a guess at that.


Here is a visual of the string.  I ran an analysis for a 2.30% ES and you can see the results between the red lines and in the upper left blue box.  It shows 19 shots within a 2.27% ES between 2886 psi and 2154 psi.

(https://image.ibb.co/kE37wJ/Stock_Mrod_tune_right_out_the_box.jpg).
Title: Re: New Convert with .25 Marauder Questions
Post by: Harpoon1 on May 14, 2018, 05:42:34 PM

Thanks Skimpy!  I have been wanting someone to post an out of the box .25 cal Mrod tune.  I don't know the fill pressures so I took a guess at that.


Here is a visual of the string.  I ran an analysis for a 2.30% ES and you can see the results between the red lines and in the upper left blue box.  It shows 19 shots within a 2.27% ES between 2886 psi and 2154 psi.

(https://image.ibb.co/kE37wJ/Stock_Mrod_tune_right_out_the_box.jpg).


Keith,

That is awesome, thanks.

I just got my "new" chronograph up and running today. If my tank ever gets here, I can give you all the data "right out of the box" you want!  8)

Fill was 3000 btw. We stopped when we saw the FPS falling off, guessing right around 2000.
Title: Re: New Convert with .25 Marauder Questions
Post by: Harpoon1 on May 14, 2018, 05:47:14 PM
How about some springer data?

This is my backyard squirrel gun, its a laser out to 35 yds!  ;D
Factory spring tweaked with some shims to "balance" the power between jsb 7.33-8.44
Vortek VAC seal
Shimmed main guide and plastic drink bottle piston liner
Ultimox 226 lube
Probaly close 10,000+ pellets through it last year.  8)

Created: 05/14/18 14:04
Description: test
Notes 1: HW30 Urban
Notes 2:
Distance to Chrono(FT): 2.00
Ballistic Coefficient: 0.021
Bullet Weight(gr): 7.87
Temp: 64 °F
BP: 30.01 inHg
Altitude: 20.00
#          FPS  FT-LBS      PF
20    660      7.61    5.19   
19    668      7.80    5.26   
18    663      7.68    5.22   
17    661      7.64    5.20   
16    665      7.73    5.23   
15    657      7.54    5.17   
14    670      7.85    5.27   
13    661      7.64    5.20   
12    660      7.61    5.19   
11    657      7.54    5.17   
10    658      7.57    5.18   
9    663      7.68    5.22   
8    666      7.75    5.24   
7    667      7.78    5.25   
6    660      7.61    5.19   
5    669      7.82    5.27   
4    663      7.68    5.22   
3    661      7.64    5.20   
2    665      7.73    5.23   
1    667      7.78    5.25   
Average: 663.0 FPS
SD: 3.9 FPS
Min: 657 FPS
Max: 670 FPS
Spread: 13 FPS
Shot/sec: 0.0
True MV: 668 FPS
Group Size (in): 0.00
Title: Re: New Convert with .25 Marauder Questions
Post by: triggertreat on May 14, 2018, 06:33:01 PM


Thanks!  If you are in need of a free spreadsheet you can download the one that I am sharing below.  It's not the Shot String Analyzer, but works good and will show you the shots within a 2% and 4% extreme spread (ES).  I don't know why the GTA Mods don't put all of these free spreadsheets the members offer up into a sticky for newcomers or for those members in need of a spreadsheet.


P.S.  This spreadsheet will work great with flipping and stripping out the FPS data from your Caldwell chronograph and is what I used.  I don't retype anything.


Click here to download the free spreadsheet (https://drive.google.com/file/d/1EBm-pOyrzbe_7awzH0Piii4KYHhR8Fev/view?usp=sharing
/)
Title: Re: New Convert with .25 Marauder Questions
Post by: Harpoon1 on May 14, 2018, 08:18:38 PM


Thanks!  If you are in need of a free spreadsheet you can download the one that I am sharing below.  It's not the Shot String Analyzer, but works good and will show you the shots within a 2% and 4% extreme spread (ES).  I don't know why the GTA Mods don't put all of these free spreadsheets the members offer up into a sticky for newcomers or for those members in need of a spreadsheet.


P.S.  This spreadsheet will work great with flipping and stripping out the FPS data from your Caldwell chronograph and is what I used.  I don't retype anything.


Click here to download the free spreadsheet (https://drive.google.com/file/d/1EBm-pOyrzbe_7awzH0Piii4KYHhR8Fev/view?usp=sharing
/)



Cool!

Thank you.
Title: Re: New Convert with .25 Marauder Questions
Post by: Harpoon1 on May 19, 2018, 04:52:11 PM
Picked up a 177 Synrod also. Been monkeying around with the preload and stroke, along with pellet weights, etc, etc,...........

Here's the most recent captured string, before I tampered with the factory metering screw setting in an effort to flatten out the curve as much as possible. Factory setting was 4+ easy and set it to 2.5 turns from zero. And the speed went UP! To 900+! Wasn't expecting that. Venturi Effect/Bernoulis principle?

Still not happy with the accuracy or consistency, which kind of go hand in hand.

Anyway,  i'd be glad to hear anyones critique of the data

BTW: fill was 2800 and stopped by 1500 IIRC, well below 2000 nonetheless.

4% looks like from 24-87 (discounting 1 shot 1 FPS below later in the string)
2% looks like from 46-69

Created: 05/19/18 12:31
Description: crosman 10.5
Notes 1: 3 turns preload
Notes 2: 10 turns stroke
Distance to Chrono(FT): 1.00
Ballistic Coefficient: 0.023
Bullet Weight(gr): 10.50
Temp: 77 °F
BP: 30.13 inHg
Altitude: 20.00
#          FPS  FT-LBS      PF
90    834      16.22    8.76   
89    834      16.22    8.76   
88    841      16.49    8.83   
87    848      16.77    8.90   
86    845      16.65    8.87   
85    847      16.73    8.89   
84    848      16.77    8.90   
83    851      16.89    8.94   
82    860      17.25    9.03   
81    871      17.69    9.15   
80    861      17.29    9.04   
79    859      17.21    9.02   
78    857      17.13    9.00   
77    859      17.21    9.02   
76    864      17.41    9.07   
75    867      17.53    9.10   
74    869      17.61    9.12   
73    862      17.33    9.05   
72    873      17.77    9.17   
71    874      17.81    9.18   
70    858      17.17    9.01   
69    872      17.73    9.16   
68    868      17.57    9.11   
67    880      18.06    9.24   
66    869      17.61    9.12   
65    876      17.89    9.20   
64    881      18.10    9.25   
63    878      17.98    9.22   
62    881      18.10    9.25   
61    872      17.73    9.16   
60    870      17.65    9.14   
59    869      17.61    9.12   
58    874      17.81    9.18   
57    875      17.85    9.19   
56    862      17.33    9.05   
55    866      17.49    9.09   
54    864      17.41    9.07   
53    880      18.06    9.24   
52    871      17.69    9.15   
51    879      18.02    9.23   
50    859      17.21    9.02   
49    863      17.37    9.06   
48    872      17.73    9.16   
47    864      17.41    9.07   
46    869      17.61    9.12   
45    861      17.29    9.04   
44    857      17.13    9.00   
43    860      17.25    9.03   
42    873      17.77    9.17   
41    867      17.53    9.10   
40    857      17.13    9.00   
39    859      17.21    9.02   
38    852      16.93    8.95   
37    849      16.81    8.91   
36    853      16.97    8.96   
35    857      17.13    9.00   
34    851      16.89    8.94   
33    849      16.81    8.91   
32    851      16.89    8.94   
31    864      17.41    9.07   
30    858      17.17    9.01   
29    859      17.21    9.02   
28    846      16.69    8.88   
27    844      16.61    8.86   
26    858      17.17    9.01   
25    856      17.09    8.99   
24    850      16.85    8.93   
23    842      16.53    8.84   
22    845      16.65    8.87   
21    831      16.10    8.73   
20    841      16.49    8.83   
19    835      16.26    8.77   
18    828      15.99    8.69   
17    838      16.38    8.80   
16    822      15.76    8.63   
15    827      15.95    8.68   
14    824      15.83    8.65   
13    822      15.76    8.63   
12    823      15.79    8.64   
11    826      15.91    8.67   
10    827      15.95    8.68   
9    821      15.72    8.62   
8    810      15.30    8.51   
7    819      15.64    8.60   
6    809      15.26    8.49   
5    807      15.19    8.47   
4    803      15.04    8.43   
3    807      15.19    8.47   
2    814      15.45    8.55   
1    811      15.34    8.52   
Average: 851.8 FPS
SD: 20.4 FPS
Min: 803 FPS
Max: 881 FPS
Spread: 78 FPS
Shot/sec: 0.1
True MV: 855 FPS
Group Size (in): 0.00






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Title: Re: New Convert with .25 Marauder Questions
Post by: HunterWhite on May 19, 2018, 05:40:47 PM
Nice.
Title: Re: New Convert with .25 Marauder Questions
Post by: dwalk on May 19, 2018, 07:17:46 PM
most mods can be done in your home workshop with ease, too...another plus for the 25 Mrod.
Title: Re: New Convert with .25 Marauder Questions
Post by: triggertreat on May 19, 2018, 08:52:04 PM
Marauder takes the win for the second year in a row at the GTA Fun Shoot.  This year was with the .25 cal Marauder by C.J (Ozarkairgunner).
Title: Re: New Convert with .25 Marauder Questions
Post by: Privateer on May 19, 2018, 08:53:30 PM
Way to go C.J.!!!
 ;D