just my opinion, it is more important what shell/load you shoot than the qty. When I first got into doubles I traded a few LC's for an english boxlock. Because it was light I shot light loads, a lot of them. I think I averaged 5,000 a year for several years and saw absolutely no wear on that gun. Obviously if you put 20,000 rounds through it there will likely be wear on the lock up.

This ain't a dress rehearsal , Don't Let the Old Man IN