Outta Air
Active Member
When a break-barrel rifle is cocked, what kind of pressures are within the cylinder? Just generally if it shoots at say 1200 fps with a 7.9g round
Your best guess or knowledge
- Thread starter Outta Air
- Start date
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There is no pressure in a break barrel air gun. What you have is either a compressed spring or a compressed gas strut when it is cocked. When the sear is tripped, the spring propels the piston down the cylinder thereby forcing air through a orifice into the barrel.
That's "Herr Doctor Professor" to you. 
BigTinBoat
Active Member
Once the trigger is pulled the pressure inside will peak somewhere between 1500 and 3500psi based on some different mathematical calculations I've seen. It's pretty much instantaneous and as such would be awful hard to measure considering as soon as the pellet starts moving the pressure begins dropping.
Vic
Ultimate Member
I'd think BTB is correct. If it is pushing the pellet at that speed, something comparable to that from a PCP, the pressure would probably spike to 3000 psi then drop.
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Outta Air
Active Member
That makes the most sense. I sure wouldn't put my hand the to find out!!! 
Vic
Ultimate Member
Probably a good idea. I have a Crossman 1322 22 cal pellet pistol. I use to put other stuff in it to whack roaches in this crap hole I lived in years ago, paper type spitwads mostly. I shot at this one roach and missed. I pumped the gun up again, 10 strokes, and the roach ran under my toaster. I just put the barrel where I last saw him and pulled the trigger on an empty chamber. Enough air came out to throw the roach into the back splash and smush it. Quite cool to me, not so much for the roach. After that I use to just get close and kill them with air. So that was an old gun. Some of the new ones would probably vaporize them or your finger.
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