I can see how a flat bottom like these knives have would be handy for knocking back a stuck firing pin on break open shotgun or rifle. Fact is they were famous for the pins getting stuck and firing the gun if you did not know the pin was stuck and slammed it shut. SURPRISE!! The punch marks in the bottom of the knife LT illustrates are pretty small. Too small for me to think that a firing pin would leave them. The other semi circular indentations might have been from banging on some part of a gun. The reason I think that is that the marks are small and squarish. MAYBE an older rimfire would have a square firing pin but those marks seem to me that they would pierce both a center fire primer or a rimfire. That is not what you want, believe me. If it did pierce the primer, it would more than likely make the firing pin stick though.
The knives would make good patch knives, but once again, cartridge guns didn't require cut patches like the "cap and ball" or the flintlocks did.
