I have shot 500 PPU 10mm loads from my Glock 20 Gen4 and had no issues of brass splitting. It is pretty accurate in my gun but no hotter than a 40 S&W. I have also reloaded the brass from these without any issues to full power levels and some cases 4 times now. I'm glad I still have 1500 of the factory PPU loads on hand with the ammo shortages going on now , they will work if need be !!!