I was also unaware of a .22Z ammunition. As for pest control with rat shot(be aware you are talking really shot range with .22 shot cartridge) the revolver will be your best option, doubt that it will feed or cycle reliably in a semi auto. Accuracy is good with both revolver and auto loaders, if you wanted to get into bullseye match shooting the auto is superior in that timed and rapid fire are much easier. Revolvers also tend to take more abuse before the jam or fail to function.
Last edited by sgms; September 28, 2012 at 03:19 PM.
Reason: Gotta learn to proof read