Another thing to consider when using a .22 (sorry if it's already been mentioned.) Get some of the small game/pest rounds. Instead of a "bullet," they have a plastic chamber at the tip, filled with a bunch of tiny BB's. They have a range of only a few feet. I've found them to be completely worthless for almost everything BUT killing chickens and turkeys, but they work GREAT for that. At a range of about 2-3 feet, you will get a devastating head shot that will kill instantly, but you really don't have to worry about much beyond that. Obviously follow gun safety and know what's behind your target, but a regular .22 bullet has a range of up to a mile, which adds too much danger to butchering day. These lose most of their energy almost immediately. Unfortunately, they cost more than regular .22 rounds, but they work GREAT.