The subsonic brand shells have been know to have issues cycling certain guns, they arent necessary anyways, most every 22 shell is subsonic anyways with the exception of the hollow point hyper velocity stuff like the CCI stinger. The noise reduction of a subsonic shell isn't that much unless you are running a silencer to quiet the rifle report, the subsonic shell only eliminates the crack the bullet makes as it breaks the sound barrier, the rifle will still go bang or in this case crack if it isn't silenced.