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Aug 5th, 2016
Thread Like Summary
Matt Stolley, Stanton Hillis
Total Likes: 3
Original Post (Thread Starter)
by KY Jon
KY Jon
Looking at a Black powder proofed gun, 2 3/4” chambers, reproofed in 1980, trying to figure out what the service pressures should be? Or are all Black proof guns to be considered the same if 2 1/2” or 2 3/4” with service pressures in the 5,000 range? After 30 plus years I finally have a basic standard pressure load range for Nitro. Black powder pressures are the last piece of the puzzle. So what is the general answer.
Liked Replies
by KY Jon
KY Jon
Shotgunjones I think you are exactly right. So we have to just base it on what pressures we can determine Black powder shells of the day would generate. Thanks to Drew there are several different known Black powder pressure loads from the period and from that I think a basic load of 5-6,000 psi is going to be my safe pressure load. In fact I loaded 50 tonight for Dove this Saturday. My 150 year old Westley Richards is going to get a workout along with my Lab of color.
2 members like this
by Shotgunjones
Shotgunjones
I think you're looking for something that was not published or documented because it was not needed or even thought of at the time Jon.

The need for 'service pressure' standards arose with the development of smokeless powder.

With black, you charge by weight and what you get is what you get. Thus, the '3 dram' load.

Certainly different powders would develop slightly different pressure, but with a 200% overload being 'proof' whatever variation there is would be moot.
1 member likes this

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