Oh my Mike: I was sure thinkin' Larry Brown would come along by now. I've tried hard for about a year to understand this, and still do not. The biggest problem seems to be that the bar, tons, psi numbers mean different things in different countries and in different time periods and there is no simple conversion formula. I DO have some conversions on this thread
http://www.16ga.com/forum/viewtopic.php?t=2642 but I'd read carefully what Larry added.
For those of us with simple minds,
a ROUGH AND INEXACT conversion is 850 bar = 3 tons = 12,328 psi and based on a calculation from Burrard's "The Modern Shotgun"; 12,328 psi would be a
proof pressure for a gun intended for a 8960 psi
service (using) load. SO-as above, try to keep the psi below 9000.
And as always-remember pressure does NOT equal recoil, and it's the foot lbs. of recoil that is going to crack the stock.
If anybody else can help, PLEASE DO.
