Originally Posted By: Drew Hause
Another gun shop 'expert'.
Barrels in that period were ALL proof tested with black powders that were far less pressure producing and slower burning than modern faster burning, higher pressure producing smokeless shotgun powders.


Boy the guys in the proof houses were not careful with their proof stamps. According to this expert they must have grabbed the nitro proof stamps by accident a lot of the time.

I couldn't resist...carry on.