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I use a 12g 2 3/4 with number 7 - trap load - works very well - doesn't make a mess (unless really close) cheap - they look a bit like they have chicken pox or something

a 223 aimed up depending on the angle will go a long way! - so will a 22 of course but a 223 will have more energy at the end of it (especially if still spinning (i.e. fired at 45 degrees or...