The SW22 likes hot ammo I only use CCI minimags in mine. A lot of the guns have come from the factory with the ejectors a little off. If you take the slide off and put a fired cartridge in the bolt you will see where it hits the base of the cartridge. A lot hit right at the edge. Take a needle nose pliers and bend it in so it just touches the bolt. You don't have to move it much don't have it touch the bolt. You will never have a stove pipe again. This even worked with subsonic ammo.