I've noticed the same. Plenty of 12 gauge locally, even 16s and 28s are easier to find. Only thing worse is 410s they're nonexistent
410 bore are tough. But every few months you find some if you are looking. If you are lucky its a good gun store and will see you cases.
Good luck.
I'm feeling a bit caught too. Even though I haven't shot a shotgun in years we only have less than 10 of those half cases of 12 left laying around. Wife demanded more buckshot so we bought 400 rounds of that a few months ago.
20 I've not even looked for. Though last times I was in an Academy they had every gauge except 410 bore.
