RE: your misfires on .22 rounds... I am seeing that occur occasionally with my BSA Rifle Shooting MB training. We shoot single shot bolt action rifles. Trigger pull / ‘click’/ count to ‘30’ / extract / confirm firing pin strike / rotate cartridge 90 degrees and reload - fires..... What is happening is in the manufacturing process. The primer media is not getting distributed evenly in the rim and you have a void. The round is only ‘slightly defective’. If, after a second or third ‘misfire’. Destroy the cartridge.