You need to think home defense, and start grabbing and hoarding 12 gauge 00 & #4 buck. It’s readily available, not that expensive, and will do you way more good than those expensive 22’s!
Yeah, I was sort of joking about the .22, sort of. :-)
I’ve been up to the gills in 12 gauge shotshells for some time now.
Especially since I discovered eastern European double ought buck loads. Cheap, and it never fails to go bang.
Back when things were *really* dry, I stocked up on target loads too. Cheap, readily available, and I’m guessing you wouldn’t want to be on the receiving end of a facefull or two across the width of a bedroom.