Back when I shot Highpower I used LC cases almost exclusively with CCI primers. I learned I could get 6-7 reloads before the necks would split. Never had a case head speperate. One thing I was warned not to do was use Federal cases with Federal Match primers. I did once and found 1 out of 4 primers would come out of the primer pocket and fall down into the trigger group. I suppose under size primer cups coupled with over size primer pockets. I would toss the range brass.