Not only does it work defensively, it takes down really big game at short range and with a game getter round becomes a 52ish gauge shotgun.
Yeah, but the ammo weighs a ton and costs a fortune, and you can fit what—5 rounds max in the rifle? I have a .45-70 and handload for it. Throwing doorknobs downrange is really fun, but I don’t see it as practical in a SHTF scenario.