Calling all 25 cal marauder REGULATED guns

[shorty]

Sounds like a good plan.

It would be great if someone came up with a larger diameter shroud with baffles to keep the length the same. You know, a receiver spacer, longer screw on the bolt to catch the hammer (or vise versa), and a 1.25" or 1.5" shroud with baffles.

The 22 is a hammer. My regged 22 synrod maxes out to around 31fpe but, I know if I jumped the reg to 2000psi (set at 1550psi now), it would be able to hit 42fpe and with that stupid plenum adapter would make it a 55fpe regulated 22 synrod.

Add a TJ barrel or whatever barrel at a length of 24" to 26" and I have no idea where it would put that FPE at (I am sure it would be high).

So many things to do.

[Sfttailrdr46]

Sounds like a good plan.

It would be great if someone came up with a larger diameter shroud with baffles to keep the length the same. You know, a receiver spacer, longer screw on the bolt to catch the hammer (or vise versa), and a 1.25" or 1.5" shroud with baffles.

The 22 is a hammer. My regged 22 synrod maxes out to around 31fpe but, I know if I jumped the reg to 2000psi (set at 1550psi now), it would be able to hit 42fpe and with that stupid plenum adapter would make it a 55fpe regulated 22 synrod.

Add a TJ barrel or whatever barrel at a length of 24" to 26" and I have no idea where it would put that FPE at (I am sure it would be high).

So many things to do.

Right now I'm watching what Lloyd is doing with my .30 Marauder. Basically with off the shelf parts he has it right at ~80 fpe and I sent him some Bobs Boat tail 70 gr .30 bullets to play with

[shorty]

I have been watching your build too. It's gonna be a nice 30 cal. You sure got the right guy building it. I just want to see Lloyd in his scientist white coat testing it. I love it when he wears that.

[Sfttailrdr46]

  Ever since I joined this forum 3 years ago I have had the privilege to meet and in some cases spend time with generous and inventive people with talent and passion for this hobby we all share. Your springs and thinking outside the box has also contributed to the significant progress we have made with PCP performance in the last 2 years

[shorty]

Gee thanks Don, I still feel like ball slapping you. "who would do something like that" ??

That's a joke . You just gotta know me to appreciate it.

Your a great moderator and I for one thank you for what you do. Still want to ball slap you though (just for fun)..... "dang" kids......

[Sfttailrdr46]

Gee thanks Don, I still feel like ball slapping you. "who would do something like that" ??

That's a joke . You just gotta know me to appreciate it.

Your a great moderator and I for one thank you for what you do. Still want to ball slap you though (just for fun)..... "dang" kids......

Just remember that I qualify as elderly and as such That might be considered elder abuse although my 24 year old stepson would rather pick on someone his own 6'4" 260 than the fat old biker that lives with his mom  Just retaliating in good fun 

[shorty]

LMBO.....

[J M]

Santa brought me some goodies for the Marauder so and I had the day off so installed and tested.

Gun is Gen II .25
Huma Reg
Hill Valve, Lightweight hammer and HF Transfer port.
Turned down bolt probe to .115
War SSG
pellet JSB 24.39

All tuning was essentially the same, method which was set up and adjust GAP and preload to get in the low 40 PF range and then shot for count.

1st attempt
Huma set at 135 BAR (read about 2200 or so on marauder gauge)
fill to 3000 PSI
31 shots
AVG FPS 864.9
SD 4.5
ES 18

2nd attempt
Upped fill a little to 3100 and lessened pre load, played w gap to get it in the 40 FP range (860 fps range w that pellet).
35 shots ( last 3 off regulator)
AVG FPS 865.8
SD 5.5
ES 17
 
Now I'm thinking I have reg. set to high to achieve a  40/40 ?
De-gas pull reg. and re set reg to 130 Bar, re assemble, gas up and go back to chrony.

3rd attempt
fill back to normal 3000 psi
Got 40 shots ...Hooo Ra ! ( although last 4 shot off reg ? Close but no cigar?

AVG FPS 860.1
SD 5.4
ES 25 ( last couple shots started dropping off averages significantly). 

Close but no cigar
 I'm thinking another small turn down or regulate to say perhaps 125 Bar would do the trick?

Thoughts or advise appreciated?


 

[shorty]

Great work JM....

One question:
Did you drill out the barrel port to match the transfer port sleeve ? If you didn't, that's where the power and shot count is going to come in to play with all the rest of the work done.

[addertooth]

J M,
     If you are attempting 40 fpe, consider dropping your regulator to about 1800 to 1900 pounds.  I had the WAR SSG adjusted to the least spring compression, and a rather large gap to get it Down to 40 FPE.  (however, I had specified the Hill valve with the 6 pound spring installed). 
It does not require very much pressure to hit 40 FPE.

 

[David9862]

I ended up replacing my war ssg spring with an 8lb spring from McMaster.  It made the gun much easier to cock and still have enough power to hit 40 fpe for 40 shots.

[mobilemail]

I ended up replacing my war ssg spring with an 8lb spring from McMaster.  It made the gun much easier to cock and still have enough power to hit 40 fpe for 40 shots.

Could you give me the P/N and/or specs for the spring?  I'm going to make an SSG for my gen1 .22, I have the other parts laying around but didn't know what spring to get.

[David9862]

This is the one i used for my gun.

[J M]

shorty, yes I drilled out the barrel port.
Adder tooth, yes I'm going to turn the reg, down a little more. its currently at 130 Bar on the reg.  but show about 2100 psi on the marauder gauge. Could be  the gauge is reading a little high?

Pretty happy with where this going, vastly improved over stock already.
I didn't have any problem hitting 40  FPE with the way its set up, contrary, my first few shot were high 800's  I had to back the hammer spring way off and more gap to slow it down a little. was shooting for 860 fps to get 40 FPE number. Thinking that was the minimum target  and that would stretch the shot count out to get the 40 shots off he regulator.

First chance,  I'm going to turn it down a bit probably to 125 to 127.5 and try again.

question
I have heard regulators have to break in (settle in), how many shots does it take and will it change shot count at all ?

[shorty]

Have no idea what kind of break in time is needed.

I forgot to say yesterday:
Welcome to the club. Congratulations on the 40/40 tune. Your gonna love it. 

[addertooth]

J M,
  The tough question is: which gauge do you trust.  Of my three gauges (two guns, one pump), I trust the pump a bit more, as it is a higher quality gauge.  So how do I validate the less accurate gauge on the gun?  Before the regulator was installed, the value displayed on the gauges were compared.  But even now a comparison is possible (even with the regulator in place).  I shoot the gun until it barely falls off the regulator, then I see how much pressure the pump needs to have before air just begins to move into the air gun.  Then I read the value on the pump's gauge and compare it with the gauge in the stock (which now shows the regulated pressure). Keep in mind all regulators will have a small pressure drop across them, the quality of a gauge can be "somewhat" measured by how small the pressure loss is.   My issue is further complicated by the fact the gauges on my Maximus on Marauder match, but differ from the pump's gauge.  Some day I may purchase a super-duper gauge to settle the issue, but for less than a 10 percent difference, I am not inclined to quibble. 

    All of the foo-foo above aside.  My Huma regulator seems to produce more pressure than what it is set for.  (roughly 7 bar higher than the actual setting).  The single sample of the Huma regulator on hand took about 200+ shots before it appeared to fully settle in.  Hope this helps you.

[WHITEFANG]

On the Marauder. 25 converted BP I used all WAR valve and more. The gun shot as a regulated gun. Shooting jsb exacts the gun shot 55+ accurate fpe. Shots at birds 100 yards+- with ease.

As for the sound I improved it with a larger shroud od on the area of the factory shroud muzzle end and it added 5+-" to the overall lenght. On the bull pup the added lenght did not look as a goose gun.

Here is the Marauder WAR bottle gun and the Evanix RS2 9MM with that set up. It can be made more friendly.

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[ezman604]

Took off work yesterday to burn a last day of vacation and get some bench time therapy.
Yep, love the Audrius regulators. But would like to try the Huma with gauge port. Anyway, extensive work on a Gen1 .25 MRod along with installation of the Audrius set to 2K. Has my external power adjuster. Will post a couple of shot strings (one for max power and one for shot count) as soon as I can get more trigger time. My goal is at least 4 magazines (32 shots) at 47-48fpe. I know it will generate at least 57fpe when turned up but not sure exactly for how many shots. Guessing at least 16. Will see.

[ezman604]

Just finished the bench work on this one. Can use a bit of tweaking to fine tune it. But what was done was an Audrius regulator set to 2100psi installed. Gauge block opened up, valve input cap opened up, poppet stem necked down and lighter poppet spring. Valve output port opened to 0.165". TP and barrel port both opened to match.
Light weight hammer added with internal SSG and medium weight spring. External power adjuster added. Power adjuster set for approximately 2 turns out for a starting area of 830-840fps with 25.39gr JSB rounds. Here's a 40 shot string. Ending pressure 1750psi.

I'll add that this one has lots of adjustability as far as power. It can be turned up and I've seen it slam out 33.95gr JSB at 57-58fpe. It can also be turned down for lower power and a much longer shot string. The SSG spring preload can also be tweaked. And one last shameless plug, this one will be available soon in a classified gate near you.




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10   838   39.6
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12   816   37.55
13   807   36.72
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17   834   39.22
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24   840   39.79
25   835   39.31
26   833   39.13
27   837   39.5
28   835   39.31
29   833   39.13
30   827   38.56
31   821   38.01
32   826   38.47
33   837   39.5
34   835   39.31
35   833   39.13
36   831   38.94
37   827   38.56
38   826   38.47
39   821   38.01
40   820   37.45

[Dairyboy]

Very nice work!