Author Topic: P-Rod Build (Read 3119 times))

Jzizzle · « **Reply #40 on:** June 20, 2020, 06:09:10 PM »

Quote from: Tucobenedicto on June 20, 2020, 01:22:17 AM

Great results!

Thanks!

Back when the balanced valve was available for the prod, what kind of power were they producing?

I have inquired to Don for a powerhouse prod valve but doesn't look like it is feasible in the near future.

All in all pretty happy with the results this far. I just hope the 25gr are as accurate at the 18gr. The accuracy from these from a 12" barrel really surprised me at 70 yards. Very impressed!

Jzizzle · « **Reply #41 on:** June 24, 2020, 02:06:52 PM »

Did some testing with the 25gr jsb. I adjusted it from 700-840fps but they didn't do well at 70 yards. I can see them swirling out of control and very unstable.

I have hit 40fpe on the prod. I think there is more if I raise the output but I see no reason as both the 34gr and 25gr didn't do well at distances. But for close range, at 25 yards they stack on top of each other.

18gr will be the go to round for the prod. Sub inch at 70 yards for 35fpe with about a 100 shots per 4k fill.

Im working the the bottle mount as well as a magpul forend.

Tucobenedicto · « **Reply #42 on:** June 24, 2020, 02:37:44 PM »

I think the last setup is an excellent choice,35FPE and 100 shots seems to me a very good compromise,not bad for a 12" barrell.

PikeP · « **Reply #43 on:** June 24, 2020, 02:38:38 PM »

Assuming you were shooting the .22 version of the 25.4's, they require more velocity for stability at long ranges, and a gun that will do it in an efficient manner...I recommend 900~ fps for those and at least 1.3 fpe/ci efficiency...

When tuned to keep the valve open long enough for maximum energy, you tend to get a lot of turbulence from the violent air leaving the muzzle along with the pellet, which presents accuracy issues...where as a tame tune that shuts the valve at 33-40% of the barrels distance will have much less air chasing the pellet at the muzzle creating unnecessary turbulence as it begins its external ballistic journey to your target...

screwwork · « **Reply #44 on:** June 24, 2020, 02:42:44 PM »

Quote from: Jzizzle on June 20, 2020, 06:09:10 PM

Quote from: Tucobenedicto on June 20, 2020, 01:22:17 AM
Great results!

Thanks!

Back when the balanced valve was available for the prod, what kind of power were they producing?

I have inquired to Don for a powerhouse prod valve but doesn't look like it is feasible in the near future.

All in all pretty happy with the results this far. I just hope the 25gr are as accurate at the 18gr. The accuracy from these from a 12" barrel really surprised me at 70 yards. Very impressed!

My bottled Prod with the SS Valve from JSAR with an .25 cal Mrod barrel that makes up to 80fpe. Detuned to 65ish fpe for shooting 34gr JSB's.
FYI, the .22 cal Mrod barrels will drop right into the Prod breech.

Jzizzle · « **Reply #45 on:** June 24, 2020, 05:31:49 PM »

Quote from: Tucobenedicto on June 24, 2020, 02:37:44 PM

I think the last setup is an excellent choice,35FPE and 100 shots seems to me a very good compromise,not bad for a 12" barrell.

I agree. Just ran a full string, it's about 85 shots on the reg and about 15 more within 12fps.

Jzizzle · « **Reply #46 on:** June 24, 2020, 05:36:56 PM »

Quote from: PikeP on June 24, 2020, 02:38:38 PM

Assuming you were shooting the .22 version of the 25.4's, they require more velocity for stability at long ranges, and a gun that will do it in an efficient manner...I recommend 900~ fps for those and at least 1.3 fpe/ci efficiency...

When tuned to keep the valve open long enough for maximum energy, you tend to get a lot of turbulence from the violent air leaving the muzzle along with the pellet, which presents accuracy issues...where as a tame tune that shuts the valve at 33-40% of the barrels distance will have much less air chasing the pellet at the muzzle creating unnecessary turbulence as it begins its external ballistic journey to your target...

Yes this is .22cal.

Currently the prod is unable to send the 25gr at 900+, and of course same with 34gr. I could raise the output pressure some more, but first I would try to find a different spring. I am using the hill 45 hammer spring and am running out of spring with a 2800 reg setting.

Jzizzle · « **Reply #47 on:** June 24, 2020, 05:39:56 PM »

Quote from: screwwork on June 24, 2020, 02:42:44 PM

Quote from: Jzizzle on June 20, 2020, 06:09:10 PM
Quote from: Tucobenedicto on June 20, 2020, 01:22:17 AM
Great results!

Thanks!

Back when the balanced valve was available for the prod, what kind of power were they producing?

I have inquired to Don for a powerhouse prod valve but doesn't look like it is feasible in the near future.

All in all pretty happy with the results this far. I just hope the 25gr are as accurate at the 18gr. The accuracy from these from a 12" barrel really surprised me at 70 yards. Very impressed!
My bottled Prod with the SS Valve from JSAR with an .25 cal Mrod barrel that makes up to 80fpe. Detuned to 65ish fpe for shooting 34gr JSB's.
FYI, the .22 cal Mrod barrels will drop right into the Prod breech.

That's good to know. Thanks. maybe one day l'll experiment with the mrod .22 barrel It would definitely yield more power with the extra 8" barrel length.

screwwork · « **Reply #48 on:** June 24, 2020, 06:36:05 PM »

Keep an eye out for a . 22 HF MM barrel, they pop out every once in a while. Nice barrels for JSB's pellets.
There is a little filing for the breech screws to have a small indent other than that not much else.
Here is a photo of shooting 18gr JSB's at 100 yards, it was super windy that day, one of these days I am going to do put the .22 cal HF MM barrel back on the gun and shoot for 100 yards again in low winds and tighten up that group.

Jzizzle · « **Reply #49 on:** June 25, 2020, 05:33:37 PM »

I had to cut as much as possible to get this pic to attach.

Here is my designed bottle support for the prod. Bottle is very rigid now. I also designed one with a rail on the bottle. That one is currently printing.

larspawn · « **Reply #50 on:** June 25, 2020, 06:39:47 PM »

Sweet John! Wish I had the skills to get into printing. Seems so complicated! Lol

Jzizzle · « **Reply #51 on:** June 25, 2020, 10:46:14 PM »

Here we go

Jzizzle · « **Reply #52 on:** June 25, 2020, 10:47:45 PM »

Another

Jzizzle · « **Reply #53 on:** June 25, 2020, 10:54:14 PM »

Next is the Magpul foregrip and a side lever breech!

Tucobenedicto · « **Reply #54 on:** June 26, 2020, 12:50:29 AM »

Great job!

Jzizzle · « **Reply #55 on:** June 26, 2020, 01:02:27 PM »

Thanks.

I will have to adjust the dimensions and reprint the support since the side lever breech increases the gap from barrel to reservoir.

Jzizzle · « **Reply #56 on:** June 29, 2020, 11:39:49 PM »

New support I've been working on...

2K1TJ · « **Reply #57 on:** June 30, 2020, 06:04:55 AM »

Quote from: Jzizzle on June 17, 2020, 05:00:30 PM

Yes, the 220cc has 2" diameter, the 350cc like then one I'm using is 2.4" diameter.

I haven't seen any 220 cc's. Where can I find these?

Jzizzle · « **Reply #58 on:** June 30, 2020, 10:31:03 AM »

eBay/AceCare

2K1TJ · « **Reply #59 on:** June 30, 2020, 10:53:23 PM »

Quote from: Jzizzle on June 30, 2020, 10:31:03 AM

eBay/AceCare

Thanks

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P-Rod Build

Author Topic: P-Rod Build (Read 3119 times))