What exactly is "copper washed" ammo? | The High Road
Jul 30, 2007· The copper prevents that. The thin copper wash seems like it would all be abraded away in just a few inches of travel, but it''s not. Copper washed bullets exit the muzzle with copper still covering the bearing surface. This can be easily verified by starting with a clean barrel and shooting several rounds of copper washed steel jacketed ammo.