I shot my first match with the Pietta '51s this past weekend. It was a five stage match, and at the end of the day, I had misfires from one of the revolvers...caps would not ignite. When I got them back to the shop, I found that the hammer was striking the frame owing to a bit of raised steel. I simply filed it out and polished the frame in the hammer slot and now it fires without issue. Also, the hand spring on one of the revolvers cracked, and although I was able to use it ok for the side matches on Sunday, I knew I'd need to replace it. So I made a new string out of hack saw blade material (.020" thick - almost identical to the original), set it in the hand, and while I had the hands out of both pistols, I polished them along their stamped out surfaces. All is good again. Better, in truth.
I very much enjoyed shooting these revolvers, and learned a lot about them and c & b in general during the weekend.