I’ve shot several thousand rounds through a variety of semi autos, single shot pistols and revolvers. I’ve also shot them in several semi auto rifles with no issues. I read so many bad comments about bulk ammo but that’s about all my wife and I shoot and we shoot a lot through a wide array of guns. Neither of us have problems with bulk no matter the brand. It’s very rare we have a dud although we do occasionally find one. It’s rare. Generally if we have a dud it fires on the second try and 99% of the time it’s a result of the round not being seated fully in the cylinder or chamber due to buildup of carbon. We keep our guns clean, after every range trip, which I attribute to reliable detonation and function.