The .22 rimfire is a great cartridge and caliber,plus it’s fairly quiet compared to a 5.556/.223.
A .22 can feed you if need be,capable of killing squirrels,rabbits,even a feral hog-if you make the right shot.
A .22 can be used as a defensive weapon,not my first choice,but if it’s what you have-by all means use it.
Some of the benefits of a .22 are it’s lighter than an A-R,or your average deer rifle-which means you can carry the rifle and lots more ammo for less weight that an A-R,and a lot less weight than a big game rifle.
While a .22 may not have enough “power” to take a guy out with one shot…what do you think it would do to one of the roving bands of gang-bangers we will surely see in any prolonged SHTF situation?
Empty a mag of .22 at one of these groups,and they will scatter like roaches in a cheap motel when you turn the light on. Many will also have.22 caliber holes in their bodies-which will cause them to bleed profusely,and cry for their mommy’s.
There are situations that call for serious stopping power-like an ’06 or a .300 Win mag,or a .454 Casull handgun, yet the lowly .22 is still a valuable part of any SHTF defensive weapons store ,is capable of providing both food and home/property defense,plus the ammo is cheap-(when you can find it)-as long as you have a plan to shelter in place,or plan to”bug out” to a different safe location-you should seriously consider having a semi-auto .22,or at least a good bolt-action .22.
I would go with a Ruger 10-22,since there are millions in circulation,lots of aftermarket parts are available,and it’s a very reliable rifle.
Do not buy a cheap-“off brand” .22 get something that’s a decent rifle,and built good enough to last.
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StarvinLarry