My grip doesn't get sore when using a hand primer, but handling the brass for an extended period of time makes my hands ache. that being said, priming has always been my nemesis. Weather its my stupid Hornady progressive press priming system screwing up, not catching a military pocket, or my stupid little RCBS hand primer getting stuck, or not feeding right, I gotta do something different. I like the press that Slick8 is using. Time for a change it sounds like.