I started out with a box of 50 just to try the stuff in .260. These were trial loads and not hot either. I went home after shooting to start reloading and lost 13 cases to loose primer pockets. So out I went again and shot most of the box I reloaded and this time lost 3 more. They are on there 5 th reloading and I have less than 25 cases that comfortably hold primers without leakage. I switched to plain old Remington and so far after several reloadings have not lost any. I am now going to try lapua to see how they last.