New Convert with .25 Marauder Questions

[Harpoon1]

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

[FuzzyGrub]

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.

[Harpoon1]

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.

[HunterWhite]

Following. Is that the same as the Savage arms 93R17 BTV?

[moorepower]

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.

[triggertreat]

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!

[FuzzyGrub]

I have a 10/22...

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

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

[Harpoon1]

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.

[Harpoon1]

I have a 10/22...

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

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!

[ShawninIL]

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.

[n2omike]

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!

[Harpoon1]

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.

[ShawninIL]

Travis will get you dialed in fer sure.

[Thane]

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  ...)

[Harpoon1]

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

[triggertreat]

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.

.

[Harpoon1]

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.

.

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! 

Fill was 3000 btw. We stopped when we saw the FPS falling off, guessing right around 2000.

[Harpoon1]

How about some springer data?

This is my backyard squirrel gun, its a laser out to 35 yds! 
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. 

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

[triggertreat]

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

[Harpoon1]

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

Cool!

Thank you.