The faster you push a bullet, the more likely you'll be to have surface spashes. The 75 A-max at .223 velocities may be perfect. You didn't say whether you were intending to save fur. If you are, you might also want to try the 60 grain v-max. It produces very few exits in my experience. It's just tough enough to get inside and then disentigrates (sp?). If you aren't saving pelts, just use something heavy jacketed enough to make sure it gets into the vitals. Any of the 52 and 53 gr target bullets or the sp's recommended earlier should work well.
