60 shells is rough but honestly that checks out because the primer pockets seat way easier when the pin hits the right side up. I made the same mistake on my first batch of 9mm and ended up with like 15 crushed primers before I figured out what was going on. The weird part is they still look fine sitting in the tray, so you don't notice until the pin jams up and everything stops feeding. Now I dump a handful out and check a few before I even start.