Has anyone here downloaded Close Focus Research's chamber pressure spreadsheet? http://closefocusresearch.com/calculating-barrel-pressure-and-projectile-velocity-gun-systems If so, thoughts? Plugging in some pretty common 9mm weights / velocities yielded some interesting results (if I'm reading the barrel length correctly). Kinda seems like a 'one size fits all' approach.

Interesting idea but there's too many variables I think for plain math to get it right. I plugged in some numbers for 9mm+p ammo and got pressures in 5.56 ranges, not quite right.

Yeah, I don't think it's factoring rise time / other variables. Top published Power Pistol loads out of a 3" (according to how they measure) put pressures significantly above SAAMI. Entered my 'warmer' PP load, ouch!

Yup, it seems to generally give numbers that are high, which I guess for safety's sake is a good thing. Mild loads seem to come up with numbers that are closer to measured levels.

1: When did they start using 'letters' in 'math'! 2: It seems from the equation below that only peak pressure is used, treating it as a constant.