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 Post subject: Can it be done ?
PostPosted: Wed Mar 16, 2016 1:11 pm 
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Joined: Tue Feb 18, 2014 7:24 pm
Posts: 684
Location: Dowling ,ontario
Can a .357 cal 81 gr jsb pellet from a 10" barrel hit 500 fps? Looking at a possible pistol build. One more thing what's the weight of .360 round ball , I'm assuming that would be the lightest in a 35 cal.
Never mind the weight on the round ball I found 71 gr to be the average. So I'll use that as a baseline for the 500 fps law.

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HW97 .177
HW80 .177
HW35 .177
HW100KTFSB 177
Winchester 257-70
Discovery 257
Airspeed .25
Frankendisco .25
FX ImpactX .223,22,177,172
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 Post subject: Re: Can it be done ?
PostPosted: Wed Mar 16, 2016 1:41 pm 
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Joined: Tue Jan 29, 2013 6:54 pm
Posts: 2415
Location: Northeastern Ontario
Getting an 81 grain pellet to get to 500 fps within ten inches sounds like a tall order, and I have no idea if it's possible. I can tell you that a .360 lead ball weighs 71 grains. See http://castboolits.gunloads.com/archive ... 20566.html


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 Post subject: Re: Can it be done ?
PostPosted: Wed Mar 16, 2016 4:09 pm 
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Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8997
Location: Coalmont BC
When working on my .30 cal CO2 pistol, I tried a 28" .357 ca barrel and just broke 500 fps with 77.6 gr. JSBs.... The roundball I had that fit that barrel weighed 67.4 gr. and hit 550 fps, just as an experiment.... To get just under 500 fps with a 10" barrel, you will need more pressure, but IIRC, somebody on this Forum got there with a PCP and a pistol length barrel.... maybe a bit more than 10", though.... Might have been Kim?....

Bob

_________________
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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 Post subject: Re: Can it be done ?
PostPosted: Wed Mar 16, 2016 5:10 pm 
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Joined: Tue Feb 18, 2014 7:24 pm
Posts: 684
Location: Dowling ,ontario
I would never even try to get there on CO2 pressure. I'll have to do some more soul searching before it even gets attempted . Have to admit , it would be a fun grouse gun.

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Not quite done collecting
PP700SA .25
Alecto .177
HW97 .177
HW80 .177
HW35 .177
HW100KTFSB 177
Winchester 257-70
Discovery 257
Airspeed .25
Frankendisco .25
FX ImpactX .223,22,177,172
K550 .22
Windy City .22
Daisy 953 .177


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 Post subject: Re: Can it be done ?
PostPosted: Wed Mar 16, 2016 9:02 pm 
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Joined: Thu Feb 02, 2006 11:35 pm
Posts: 3099
Location: Alberta Canada
Voltar was the first to produce a 357cal that was over 500fps with rnd ball. It was built for Jim Chapman/ aka Amercan Airgun Hunter, who just last year sold it. IIRC he used it in Africa upon one of his airgun hunts for Merkats. Based off a 2240 pistol, pcp, with a 12" bbl.
As for Co2 youd be hard pressed to achieve 370fps with Co2 and a 12" bbl. In .310ball 420fps is achievable but at the right temperture, expect 380 to 390 as an ave.

You could look into building with a Don Cothran Powerhouse valve, or that of a WAR valve. I have the experience with the Powerhouse. But you would be in RPAL territory there. When I retro fitted a Crooked Barn 32cal (co2) pistol. As an experiment as to the potential of the Powerhouse Valve. 80fpe with a 90gr cast bullet was attained from a 10" bbl. It was then detuned to a 25 fpe to fit guidelines as being a nonrestricted airpistol.
Reaper is the owner of that. Send him a PM and get his take. I also built him a .300 cal uses JSB 30cal pellets with a BNM breech and 30cal magazines from Lloyd Sikes, the Airgun Lab, Again detuned to a 25fpe non restricted airpistol. Just so you know, just using an RVA is not an advisable way to detune the valve. Playing with fire there, IMHO. Dons valves are formated more so for rifle builds for our Canadian market.

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Whitewolf


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 Post subject: Re: Can it be done ?
PostPosted: Thu Mar 17, 2016 11:03 am 
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Joined: Tue Apr 03, 2012 12:08 am
Posts: 821
Hello Hobbyman,

The short answer is YES it is most certainly possible
But it more then getting the parts and putting it together like a 2240.
It will likely cost about twice as much as initially thought.
I'd start by picking up the barrel from Sean Pero and stainless steel
pressure tube assembly and valve from Don Cothran.
A 2240 or 17t trigger frame can be used, I like the .17cal 2 stage .target trigger
Blue forks is also an option.
After that you need to decide if your getting a custom breech made up or modifying another
One. Then there's the transfer port and custom bolt.
I believe Whitewolf still has some materials for that.
I would suggest him putting it together as to hone the basic function
Of each part to work in conjunction with each other.

I can help you build a recipe for success I just wanted to know it will cost you on shipping and exchange. The cost of quality material and the machine and assembly time.

But I can say that it is totally worth it to build a legend.

Here is some light readings of a few of my Bigbore builds.

topic62470.html

topic69549.html

topic69188.html

topic69998.html



Reaper

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 Post subject: Re: Can it be done ?
PostPosted: Wed Aug 31, 2016 7:51 am 
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Joined: Tue Feb 18, 2014 7:24 pm
Posts: 684
Location: Dowling ,ontario
Whitewolf wrote:
Voltar was the first to produce a 357cal that was over 500fps with rnd ball. It was built for Jim Chapman/ aka Amercan Airgun Hunter, who just last year sold it. IIRC he used it in Africa upon one of his airgun hunts for Merkats. Based off a 2240 pistol, pcp, with a 12" bbl.
As for Co2 youd be hard pressed to achieve 370fps with Co2 and a 12" bbl. In .310ball 420fps is achievable but at the right temperture, expect 380 to 390 as an ave.

You could look into building with a Don Cothran Powerhouse valve, or that of a WAR valve. I have the experience with the Powerhouse. But you would be in RPAL territory there. When I retro fitted a Crooked Barn 32cal (co2) pistol. As an experiment as to the potential of the Powerhouse Valve. 80fpe with a 90gr cast bullet was attained from a 10" bbl. It was then detuned to a 25 fpe to fit guidelines as being a nonrestricted airpistol.
Reaper is the owner of that. Send him a PM and get his take. I also built him a .300 cal uses JSB 30cal pellets with a BNM breech and 30cal magazines from Lloyd Sikes, the Airgun Lab, Again detuned to a 25fpe non restricted airpistol. Just so you know, just using an RVA is not an advisable way to detune the valve. Playing with fire there, IMHO. Dons valves are formated more so for rifle builds for our Canadian market.


Sorry for bringing back the dead but this pistol idea won't leave me alone. Can someone point me to where I can find law on 25 fpe limit on non restricted pistols.
Thanks

_________________
Not quite done collecting
PP700SA .25
Alecto .177
HW97 .177
HW80 .177
HW35 .177
HW100KTFSB 177
Winchester 257-70
Discovery 257
Airspeed .25
Frankendisco .25
FX ImpactX .223,22,177,172
K550 .22
Windy City .22
Daisy 953 .177


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 Post subject: Re: Can it be done ?
PostPosted: Wed Aug 31, 2016 11:55 am 
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Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8997
Location: Coalmont BC
I don't think the 25 FPE is the law, but with the pistol in question being a .32 cal, and a roundball in that weight being about 45 gr., at 500 fps that would be 25 FPE....

Bob

_________________
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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 Post subject: Re: Can it be done ?
PostPosted: Wed Aug 31, 2016 12:32 pm 
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Joined: Tue Feb 18, 2014 7:24 pm
Posts: 684
Location: Dowling ,ontario
Thanks Bob , but didn't think of doing the math that way. Seems to be the logical explanation .

_________________
Not quite done collecting
PP700SA .25
Alecto .177
HW97 .177
HW80 .177
HW35 .177
HW100KTFSB 177
Winchester 257-70
Discovery 257
Airspeed .25
Frankendisco .25
FX ImpactX .223,22,177,172
K550 .22
Windy City .22
Daisy 953 .177


Top
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