A slug from a 12 ga Rem 870 does a lot less damage to the meat than a rifle bullet. 20 ga is to light for me and only kids and women too small for a 12 hunted deer with them as the slug loses speed pretty fast.
With standard velocity slugs, not the higher power ones. slugs from my 870 at ranges to 70 yards make one hole in the target. And even after disassembly and cleaning the zero doesn't change. Pretty remarkable within its range limits for a smooth barrel.
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