I actually happen to disagree with some here. Have you ever plucked a crow, they ain't that big without feathers, so in my opinion 1/2 moa would be the minimum standard I would use. There are enough forces at work against you in the field that your rifle shouldn't be one of them. As far as semi auto for a second shot..........I would concentrate on getting 100% kills on my first shot, then worry about potential follow ups. My personal choice for this type of sport is a Rem 700 Stainless Varmint in 22-250 with a 26" tube and 52 gn Sierra HPBT match at just over 4000 fps and shooting 3 shot .375 groups pretty consistently. Big cloud of black feathers before you hear the boom, gophers turn from solid to liquid in a micro second right out to 300+ mtrs, everything I have turned this rifle loose on has been seriously impressed, if not favorably, definitely seriously. JMHO