I really don't want this to be a discussion about overpenetration. This always comes up whenever discussing rifles for home defense. I've seen the tests of #4, 00, slugs, 5.56, and .308 on multiple walls. I get it. Instead, I want to focus on effectiveness on the adversary target at 25 yards or less and on practical considerations of each weapon. I know 5.56 carbines have been compared to 12 gauge shotguns extensively for law enforcement purposes. The carbines have clearly won preference but for a variety of reasons other than terminal effectiveness. I would rather see comparisons to larger caliber rifles, and to keep it relevant to more people, semi-auto only.
To be a little more specific, consider something like a Benelli M4 or Remington V3 Tactial vs. an AR-15 in 6.5 Grendel, .300 Hmr, or 458 Socom, or an AR-10 in .308 or a short M1A like a tanker or socom model.
To be a little more specific, consider something like a Benelli M4 or Remington V3 Tactial vs. an AR-15 in 6.5 Grendel, .300 Hmr, or 458 Socom, or an AR-10 in .308 or a short M1A like a tanker or socom model.