Following on from the gas venting thread, I thought I'd better start another.
How much pressure is required to blow a primer? SAAMI list 65 000psi as the safe max pressure for cartridges, but when a primer does blow what was the pressure to do it? 70 000, 75 000psi?
I was wondering how much leeway/safety margin lies between 65 000psi and blowing a primer.
On another forum, a bloke gets 3 400fps with a 100gn bullet in a .257 Roberts and over 3 000fps from a 140gn in a 7x57. He has never reported any issues like blowing primers. If he's exceeding 65 000psi, how much more pressure till something gives?
I thought one of the gun writers might have seen pressure data indicating when primers will blow.
Interesting.
