I once bought some Squires- Bingham .22 LR at Kmart, along with two rifles. I had to clean metal shavings out of the rifles to get them to operate, and I still had a lot of misfires. I pulled down some rounds and found that the priming mixture was overly brittle and had broken away from the rim. Despite buying the ammo over 1,000 miles apart, you may have bought some out of the same lot. I would report the failures, along with the lot numbers, to the ammo manufacturer, so they can figure out if there was a problem in their manufacturing process.