12 gauge with number 4 or 5, 3 inch turkey load. Does a great job and out 30 yard or more you wont be able to tell they are hit. We hunt fox with dogs most of the winter and have super luck with these loads. A 22 or mag has to big of a margin off error and the fox is often wounded. the larger calibers make too big of a hole in the hide. When skun a big dog fox is seldom any larger than a 4 inch coffee can.