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PostPosted: Wed Mar 02, 2016 5:21 pm 
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because my 1322 is a pistol I need to stay under 500fps so that I can still cart it around to hunt bush chicken. My thought is that with a .25 pellet at 495 fps I should have plenty of bush chicken stopping power. What are your thoughts and suggestions?. thanks in advance for your help.


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PostPosted: Wed Mar 02, 2016 5:45 pm 
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25 calilbre with a 25 grain or so @495fps and you're looking at almost 14fpe in a pistol.'ll definitely be keeping an eye on this thread because I wouldn't mind a gun like that myself. :D I found this cuz I was ALSO curious.......topic52655.html

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PostPosted: Wed Mar 02, 2016 6:49 pm 
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Ive done it among other members but extensive valve mods among others are required aswell as pumping :( if all you need is 1 shot then itd be great but yes much pumping indeed... Barrel in question was 11.5" valve was flat topped, bored out, ported/angled, modded stem/spring and stiffer hammerspring... i was lucky to get 480'ish but that was just my results :axe: good way to get pointers though, i never thought of asking i just Googled and went from there! Jealous :twisted:

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PostPosted: Wed Mar 02, 2016 7:32 pm 
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Quick check turns up at least one fellow who managed 496 ish fps in .25... with 20.6gr pellets and 15 pumps.

Have a 2540 and a 1322....might be fun to swap some parts around and throw together a 1325 and see what it'll do. :) See how much time I have tonight.

Al


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PostPosted: Wed Mar 02, 2016 8:46 pm 
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Location: Woodstock
I would be looking at a serious build like rsterne's uber-carbine to power it. I was a heavily modified 2289 (1377 cousin) with a 2200 tube.

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PostPosted: Fri Mar 11, 2016 5:14 pm 
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Based on the the feedback from members with more experience than me I am going to build a serious power plant for this project. I will be making my own "uber carbine" thanks to the generous help of rsterne. It may or may not end up a .25, I may build both, who knows.


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PostPosted: Fri Mar 11, 2016 8:53 pm 
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Not sure if you can machine or what equipment you have access to. I could punch out a Uber-Carbine FTP pretty quick, they were longer pistons. Delrin for the back end (fork) and aluminum for the head.
I could also run a quick aluminum band to hold the trigger group.

Michael

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PostPosted: Fri Mar 11, 2016 9:33 pm 
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Quote:
Quick check turns up at least one fellow who managed 496 ish fps in .25... with 20.6gr pellets and 15 pumps.

:shock:
Doesn't that seem like a lot? Not disputing; just surprised. . .

DerekVinyard wrote:
. . .I could also run a quick aluminum band to hold the trigger group. . . .

Picture, drawing or link please Sir!
If this is what I think it is, are they available for other (13/22XX) guns?

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PostPosted: Fri Mar 11, 2016 9:44 pm 
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15 pumps? More than Crosman recommends for sure...enough to cause some stretching and wear in the pin holes and linkage pivots in time.

15-25 pumps never seemed like a big deal "back in the day"...unless a fellow wanted a quick second shot. :lol:

Not everyones Cup-a-Joe.

Al


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PostPosted: Fri Mar 11, 2016 9:49 pm 
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Image
[url=http://s519.photobucket.com/user/DerekVinyard1972/media/Custom%20Parts/Barrel%20Band%20Pivots/IMG_6941.jpg.html]
Image[/url]

Couple of parts for the Uber-Carbine. No shot of the FTP, but it was very typical for 13xx...

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PostPosted: Fri Mar 11, 2016 10:43 pm 
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This should make it easier for you....

Image

Image

Image

Image

Image

I used a 2200 tube and linkage so I was starting with a rifle and didn't have to worry about staying under 500 fps.... In .25 cal, you might not have to worry about that, but the 50% greater swept volume of the pump compared to a 2289 makes it well worth it....

Bob

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Last edited by rsterne on Fri Mar 11, 2016 10:57 pm, edited 1 time in total.

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PostPosted: Fri Mar 11, 2016 10:49 pm 
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If drawings aren't your thing, perhaps photos will help....

Image

Image

Image

and the results.... Two shots at 600 fps with 14.3 gr in .22 cal on 19 pumps with the 2200 spring.... Three different hammer springs are shown.... Too hard to pump with the Disco spring, IMO....

Image

Playing with hammer springs to prevent the retained air should allow you to approach 495 fps in .25 cal with a 20 gr. pellet.... and have a non-PAL quarterbore Carbine.... Note that the gun hit over 14 FPE at 15 pumps in .22 cal.... You can do it with a 1377/2289 pump, but it will take you 50% more pumps.... and you will definitely have to beef up the pivot pin assembly, like I did above....

Bob

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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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PostPosted: Fri Mar 11, 2016 11:26 pm 
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Bob your design of the Uber-Carbine was a favourite of mine. You designed a lot, but that one was simple, effective and doable for most builders. You built a beast of a pumper powerplant...
When he wanted to step up the 1322 to 1325 your beast came back to mind.

Michael

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PostPosted: Fri Mar 11, 2016 11:56 pm 
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Yep, a very fun and effective Grouse Gun, too.... :mrgreen:

Bob

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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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PostPosted: Sat Mar 12, 2016 2:47 am 
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Location: Victoria, BC and Clarkston, WA
I have got a .30 cal barrel, Think I could make a nice 30 .CO2 pistol, 3040! I do have a Mold to start casting .300 rounds for ammo! Need to get home and into the shop.

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