On a rifle caliber thread? I agree with Lurker that you should stock .22 lr and a 30 caliber round. I would like to be able to afford an AR10 and use .:08 but can’t swing it so my SHTF plan calls for .22 and .30-30 just like the article states. I can’t shoot much out past 100 yards anyway and with flextip I’m good out to 200. I also planned on not having semi-auto since they rely on clean gas exchange and went with lever actions that are easier to maintain.
I have a lever-action Henry Big Boy chambered in .357mag, along with a pristine 1976 Colt Trooper Mk III 6” revolver in .357mag, too, so those two would be a good option. Both are a lot easier to maintain than the ARs and 1911s.