The recent manufacture stuff is polymer coated. It works much better in semi autos than the lacquered cases. Some of the Russian stuff is zinc plated and works well too Neither one are my first ammo choices, but with ammo prices the way they are I bet they're selling a lot of it. The other day I was shooting a group with Silver Bear to compare to my hand loads. I had one of the cases stuck in the chamber of my AR. When I punched it out with my cleaning rod and examined the case, the primer had blown out. Obviously an over pressure load. I've fired thousands of the steel case stuff without prior incident. Guess QC let one slip by. No damage done other than the aggravation.
Savage