Wasn't sure where to ask this, so here I am.....
Picked up a large assortment of misc. old ammo a couple years ago, some old feller's collection. Nothing I'm going to actually shoot, just looking to fatten my own cartridge collection.
In this mess, there's 14 rounds of "REM-UMC .30 USA". Rifle rounds, rimmed cases, about halfway between .30-30 and .30-06 length-wise.
Anybody know what these are? Is this caliber known by another name? These look to be original, not reloads, in good shape. Never heard of .30 USA.