2 Piper, thanks for that info on the 2 types of proof. When I get off work, I am going to go examine my Remington 1894 10 ga to see what, if any proof marks it may have.
As I recall, the MAP for 10 ga 2 7/8" hulls is 10,500psi. If the proofing logic of using proof loads holds, then I am going to assume that my 10 ga (with damascas barrels, made in 1904) was proofed somewhere in the vicinity of 13,000 psi.
If that's true, then maybe I can possibly worry a little less when using published load that create 8,000 to 9,000 psi.
Mergus
