There is a big following for the AR-10 and many a good tactical scout rifles and carbines too. Lots of M1A configurations were sold during the panic buying, with the scout snipers, and tactical rifles, and then lastly the good ole deer rifle is also well suited in .308 win. It is more expensive to shoot than .223 but it didn't stop anyone from buying it all. It's not just cabela's and wal mart thats out either, lots of places, actually quite a few places are still out, and will remain so if they do not enforce a purchase limit per customer.
The same few guys keep lining the counters with thier buggys and carts just waiting for the same trucks to arrive. When it gets there each time, those same guy's just buy every box that comes off the truck, and it never is what amount you would think either. One guy with one shopping cart can clean out the whole thing in one transaction. Then lots of pissed of customers yell and argue about it with him, the store manager, the corporate office, the owner, etc... but that's how its been lately around here, the same guys buying it all each time the truck comes in. Heck you can even try to beat the guy in there, but he seems to be glued to that counter before you can even run back there.
Good luck with finding some you don't have to fight over. I hope all that crap settles down soon. This is getting old, boring, and it's non productive for all the people that still can't seem to find ammo they really want. Seem's to keep coming up for sale on line though, despite not finding any in town....