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All Springer/NP/PCP Air Gun Discussion General > Engineering- Research & Development
357 pistol build
TheBeardedGunsmith:
I dont know if any of you remember my thread on building the ridiculously powered 50 caliber air rifle but I wanted to try my hand at a pistol and decided on .357 caliber. I started with a Green Mountain barrel blank and machined the breech into it, made a pellet probe, and a proprietary valve that I've been working on. I can't go into the valve until I get it patent pending but it works phenomenal. The tube is stainless and I only cheated by using the Crosman grip assembly. Hammer, cocking knob and all of that I also made. It gets 2 shots thanks to an orifice that I added in the pressure tube but its not regulated. I didn't have any proper airgun ammo or pellets so I pulled some 148 grain bullets from some 38 special that I have an over abundance of. It will launch those at 798fps. I bought 81 grain JSB match pellets that it'll launch at nearly 1100fps. The second shot is about 75% that of the first. I wanted to outdo Cothran and Quackenbush and believe that I succeeded! The fill pressure is also 3000psi. No manometer so I use the gauge on my pumps. It's very accurate too.
TheBeardedGunsmith:
Fixed photo issue
subscriber:
Nice job, Jeff
It looks like the breech is integral with the barrel, by being cut into it. The effective barrel length in front of the breech looks like 8 to 10". That is pretty good performance for that barrel length.
Should this thread be in the PCP gate, or the engineering gate?
TheBeardedGunsmith:
The usable barrel is 12 inches. I also didn't know there was an engineering gate. If a mod could move it, that would be awesome.
subscriber:
I asked the mods to move this thread to the Engineering or Big Bore gate. Whichever seems more appropriate:
Engineering gate: https://www.gatewaytoairguns.org/GTA/index.php/board,164.0.html
Big bore gate: https://www.gatewaytoairguns.org/GTA/index.php/board,119.0.html
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