Ok, Ive been doing quite a bit of thinking and researching (on top of all the other I had already done), mostly about the .22LR. I am considering a 10/22 as a primary SHTF weapon, mostly because Id then have the option for much larger magazines (instead of 10rd). Other advantages would be much less noise and muzzle flash, much cheaper (I could afford to practice 10x as much, literally, than with my 9mm carbine), and much smaller ammunition meaning easier to carry. This would be for an On-The-Run, SHTF situation. There would be no desire to get into any gun fights, and since I like to focus on shot placement anyways I'd do the same no matter what caliber I was using. As far as home defense, Im thinking Ill trade my 9mm carbine in toward some 9mm or even .45 pistol, so as to be sure I am doing the most possible damage for the few shots I might be able to make in true CQC. But, for anything out of the house the 10/22 would be my primary weapon (unless it was like, my back yard). Id either carry my .22 pistol or the HD pistol as a BUG for SHTF, but Ill have to decide on that later (obviously both have advantages). My main concern about the .22 is the ability to penetrate a skull. The hottest .22LR rounds I found on CheaperThanDirt (40gr @1470fps) has almost the exact same energy as one of the hottest .32ACP rounds I found on the same site (60gr @ 1200fps), and I have never heard anyone state that the .32ACP won't penetrate a skull. Hell, on BrassFetcher.com, the average penetration of the .22LRs is deeper than that of the .32s they tested. This gives me reason to believe that most of the beliefs that a .22LR won't penetrate the skull come from either very old accounts (before more modern plating and velocity advancements), or from typical internet hearsay and the also-typical "yeah, I believe that too, so Ill also repeat that it is probably true." Just making sure that if, hypothetically speaking, zombies were attacking, that I'd be able to efficiently dispose of them . I am not talking about hit men shooting point blank into the temple and what not, I am just talking about if I hit a skull at 20 yards (from any common angle), the round will most likely penetrate, correct? As far as the wound channel, a good .22lr (which is what Id be using, the aforementioned 40gr @ 1400+fps rounds) will expand to about .34", or almost the diameter of a 9mm FMJ. And, being honest, I don't see myself ever having more than a few mags worth of 9mm HPs around (for HD / carry), and the rest would be FMJ. Lastly, from testing Ive seen, penetration should easily meet the 12" minimum. So, as far as its effectiveness for my needs, there shouldnt be too much of a difference from my current 9mm. So yeah, what do you guys think about all this? Thanks.