Has anyone had to replace the target trigger? Last week at the range for the first time I couldn't cock the trigger I took it home and readjusted it, if I get below 15 oz. its not reliable. I'm the 3rd owner and I put over 3K rounds through it, I've replaced the barrel. I'm also starting to get primer cratering and the occasional pierced primer, I was never at max. load now I'm having go back off the loads to stop the cratering. I think its wearing out?