Have we ever figured out how many Bars pressure modern Black Powder Proof is? Has anyone asked the Proof house what it is or do they know? And is 65mm Black Powder Proof the same as 70mm? I have sent in a question to the proof house. Time will tell if they answer. All I want is clarity. Is Black proof 600 Bar? Or more directly what is the service pressure for modern Black powder proof. Somebody knows.

Last edited by KY Jon; 03/03/24 12:52 AM.