I have a nice old 336 made in 1951 or 52. If I dry fire it I break off firing pin tips at the shoulder of the pin after just 2 or 3 dry fires. Obviously I should avoid dry firing this rifle. However, I have a number of other 336's and one 1895 cowboy. None of the others exhibit this tendency. What do you suppose is wrong here? I have gotten pretty good at changing firing pins but that doesn't mean that I like it. Any suggestions (other than the obvious one of not dry firing the gun) as to what I should look for? I am reluctant to take this gun anywhere but the range because it is just too iffy. I want it to be more reliable like my others.