Dirtiest ammo you've ever shot?

[ttocswob]

My 9x18 rounds loaded w/ Unique.

Anything by Remington UMC (especially the old yellow box.)

Brown Bear dirtier than Silver Bear (9x18) but cleaner than the above.

My Yugo 7.62x39 from Aim is quite clean, better than Wolf, only minor complaint is the orange primer sealer flakes all over the receiver.

Edited June 10, 2011 by ttocswob
Yugo

[LawVol]

Federal Champion 9mm that Wal-Mart sells shoots pretty dirty. It fouls up the piston on my P7 pretty quickly.