[RedMonqey]

Why not go on a supply run to a nearby armory...

Probably somebody smarter and well organized ALREADY got there first.

Also Bulldozers run on fuel, which also would be hard to scavenge...

And since all the easily obtained ammo has already be spent(and no more being created), one has to make do with one finds..

Simple post Apocalypse Economics 101

[catnipman]

“Also Bulldozers run on fuel, which also would be hard to scavenge...”

And yet no one ever seems to struggle very much to keep their vehicles fueled, and the bad guys always seem to have an unlimited supply of ammo. Plus the liquor shelves in the stores are always full: liquor would have been the first thing to go.