I went to load up some light plinking loads so I took the published starting load from hodgdons web site of 25 grains of varget with a 60 grain hornady sp bullet. I loaded up 5 and took a box of 55 gr pmc. shoot both through a chronograph. pmc averaged 2750fps and the hand loads averaged 2650 with no real pressure signs so I loaded up 60 rounds and shot them on another range trip. when I got the brass out of the tumbler I noticed the primers were starting to flatten out and had 6 or 7 with case neck splits. should I be worried about any damage to my rifle?