Not a stupid question . A stove pipe jam occurs when a fired case does not fully eject
and is left stuck half out of the action . It usually happens in semi auto actions and
can be caused by a dirty action or week recoil spring . It also can be caused by the
ammo not having enough energy to blow back the bolt and eject the case . Some
lower velocity ammo does not have the power to work in some semi auto guns .
Some ammo is not manufactured accurately to fit all actions and binds causing miss
fires and stove pipes . Some bullet shapes don't perform well in some guns .
That is why it is always a good idea to try different ammo in your 22 rimfire and find
out what it likes , reliability and accuracy wise , before buying large amounts .