Yep. At that time it was selling by the ton at around $4 a hundred rounds, $3 if you bargained hard. I almost asked the guy where the siding was to park the freight train. The quantities were staggering. From late 1941 to summer of 1945, Frankford Arsenal alone produced 1.1 million rounds of .30 ammo - per day. Remington and Winchester started later but each just about matched that. We talk about lot numbers; at FA, a "lot" was a 100 car freight train, and that is really a "lot" of ammo.
.30-'06 into a 7.7? Not even with a big boot. I said the reverse.