someguy2800
Member
Incidentally, out of curiosity I looked what it would take to shear off the half-cock hooks or through the sear. The shear strength of 4140 is about 60 thousand pounds per square inch, and the cross section of both those parts at the relevant point is about 1/64th of a square inch. So that suggests that about a thousand pounds of force were required to cause the damage you described.
It seems to me that without the help of either a file or rust or some sort of repeated blows causing fatigue, it ain't gonna happen. Or i guess if an elephant stepped on the hammer.
I didn't realize they had 4140 steel in 1876