I stopped by the two local Walmarts.
One has a pile of .410, a pile of .270, and a few boxes of 20 gauge. They appear to be the same boxes from week to week. That Walmart is in a bit of a shady area, so I wonder if something is going on.
The other Walmart had their ammo case 1/4 full of .270, no joke. There was some .30-06, some of the magnum cartridges, and a pile of Winchester buckshot.
I wonder what it is about the .270. Other posters report it being widely available despite the panic.