I have a Sharps rifle that I bought as a barrel action in 1979 and stocked it myself. It originally was a .45 x 3 1/4" (45-120) and I shot three moose with it over several years of hunting...all one shot kills. I then rebarreled it with a McGowan .50 cal business barrel in .50 Alaskan, to get away from the recoil of the big .45 cal. Now I shoot a 600 gr. BACo bullet and 90 gr. Swiss 1 1/2 Fg...so I didn't get too far away from recoil, did I? I have not used the big .50 yet for hunting, but one of these days, I'll get drawn for bison up north, and then it'll be time to take her along.
Firing pin issues: mine is a Farmington NY rifle with a four digit serial number. The first thing to go was the tip of the pin separated. I simply faced it off drilled a hole and set a new pin in the cavity. Then the one piece pin shattered across it's width, so I silver soldered it back together, and it has been standing up just fine since then. I should buy a replacement pin for it, but I'll be damned if I'm sending my breech block away, and then have to pay taxes on it when it returns to Canada, as if I had purchased a new one. BACo sells a replacement pin, but I can file one out cheaper, especially with our dollar in the toilet.