Quote:
Originally Posted by red-beard
There are "debates" on a rifle vs. a pistol at short ranges. One thing that was found, shotgun 0 and 00 buck penetrate walls better than 0.223/5.56. 00 doesn't spread out much in short distances. Each pellet is about equal to being hit my a .32 ACP, and there are ~15 pellets. Most pistol rounds do not fragment or lose much energy going through sheet rock.
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Exactly. I don't think anyone would argue that .223/5.56 FMJ will penetrate drywall with ease. So do most pistol calibers though (even more so than .223/5.56 in specific cases). There is a reason that the vast majority of door-kicking LE agency units have replaced their (pistol-caliber) MP5s, etc. with 5.56mm AR/SBR platforms. It is a versatile caliber/round, with many ammo choices available for the intended use. From frangible, soft-point, OTM, etc. to bonded and barrier-blind "penetrator" rounds.
AFAIK, most of the door-kickers mentioned above are using heavier soft-point ammo for interior work, and over-penetration is not an issue, relatively speaking.