I usually shoot around 20-30 a year around the house before they try to get in the attic. I started out with a Marlin model 60 .22LR. I then moved up to a .17HMR. When their heads started disappearing and the entrails stretched 3 feet from the body, I went back down to a .22 as long as I am around the house. Works just fine. In the field, its back to the .17 though. Squirrel hunting is so much fun too.
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