As a range officer, I see thoundands of rounds of 22 rimfires shot yearly. I have no loyalty to any brand. I record any malfunctions I see, so I have some observations. The most consistant round of 22 ammo I have seen in the last 20 years is the Federal 550 packs. I detect an average of 1 misfire or squib per box of 550. I have seen them shot in countless firearms. The worst I have seen are the Remingtons. They were so bad, I bought a bulk box of 550 and shot them in 3 different firearms. I did this in an hour. I recorded misfires and squib loads. I have since misplaced the data, but IIRC there was @2 duds and 3 squibs per 50 rounds.