kkn, the deal, whether it's coyotes or deer, is a quick, clean kill. Expanding bullets do a better job than those that expand only a little, if any. It's difficult to get as high a velocity from a .223 with a heavy bullet, and out at 400 yards or so the probability of expansion declines in dramatic fashion. Penetration is a different matter, and of generally lesser importance.
What sort of "long range" do you really envision? For central Texas predators, you don't really need a heavy bullet. Bullet weights ranging from the 50s to the 60s would do quite well. I've busted feral cats at 300 yards with a Swift with 52-gr Sierra HPBTs, and they were always DRT.
Art
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