I don't know if this is exactly true or not, it's JMO, but my semi auto 22's don't particularly like the bulk rounds as well as the ones like CCI that are individually put"holders" like centerfire rounds.
I was wondering if maybe during the bulk packaging process if one here or there gets dinged or nicked up a little which could cause them to hang up during the auto loading process?????
Again, just a little thought I had. In my boy's single shot 22 the Winchester Xperts work flawlessly.