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 Post subject: Proof Pressures
PostPosted: Tue Jan 24, 2012 3:33 pm 
Presentation Grade
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Joined: Fri Nov 20, 2009 3:56 pm
Posts: 919
Location: E. MA
I am awaiting delivery of the Standard Directory of Proof Marks, but in the meantime am trying to determine what pressures were used for the following proof marks (circa 1920):


Thanks in advance, Doverham

 Post subject: Re: Proof Pressures
PostPosted: Fri Jan 27, 2012 12:16 pm 
Diamond Grade

Joined: Tue Dec 06, 2005 8:15 pm
Posts: 1231
Location: MidAtlantic
They used twice normal powder change and 1&1/3 x standard shot charge. I can not provide solid numbers which is great because unless the gun in question is as new when looking at old used gun this info is pretty much of little of no value.
It was originally designed to handle 26g to 28g load at 65MPa or less. Good luck laddie. Wee,wee.

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