So far, I have ordered 1800 rounds of 62 grain SS109 M855 "penetrator" rounds that come in sealed packs in ammo cans.
"Manufactured in 2010 to strict NATO military specifications for the DAMC (Danish Army Material Command) and carries the AMA headstamp with the NATO cross. .... snip..... bright, pristine condition... there is no patina or tarnish."
This will have to do for my "pretty darn good" stuff. Not match grade, but not dirty shoot'n steel stuff, either.
I'll be on the hunt for lesser grade ammo, now.