I don’t know, maybe I’m just lucky like that but never had problems with any of the PPU brass in 9.3, 8mm mauser, 7x57. Or bullets for that matter. Only improvement I would make on the PPU .366 285 gr RNSP is make the jacket a little thicker for better penetration on larger game, although I’ve talked to several people that have used it on Cape buffalo and it stopped under the skin on the off side, so I guess it’s thick enough? Have to try it and see.