My rule of thumb is 10,000 rounds per AR, 5000 rounds per pistol and 1000 rounds per tactical shotgun.
I’d rather the 10K rounds of .22 LR. You can carry a thousand rounds on you and can plink, relatively unseen from great distances.
.22 rounds can be lethal up to 400 yards, for a deft shooter. If you only wound, well then that’s 4 people that have to carry the sorry SOB off the field of battle.
You get nailed with a .22 round out of a long rifle you are in a world of hurt.
.22LRs are severely underrated in SHTF situations!