I use Federal bulk packs and they work great. As with any .22lr ammo your going to have a couple duds in a bulk pack. I really like shooting this gun I have had it just over a month and have shot over 2500 rounds through it. I put a UTG forward grip and Barska 2X red dot on it. Im not a huge fan of this scope and looking to maybe buy a BSA "Sweet .22". Anyone else have any scope suggestions? All in all this gun is a blast. Im not sure if its just me but it feels like it hits a little harder than most .22's..