One thing to be said for current production Russian ammo, it runs well through Combloc guns that were designed for it. There are two major manufacturers imported here. Wolf brand made at Tula Cartridge Plant[Russia]. Brown/Silver/Golden Bear made by Barnaul Machine Plant [Russia]. All ammunition is steel cased, noncorrosive, and Berdan primed. Wolf ammo is polymer coated. Brown Bear is brown lacquer coated. Silver Bear wears a zinc wash. Golden Bear wears a brass wash. U.S. manufacture self-loading pistols and rifles may or may not like the steel cased ammunition. It is best to try samples to see if your firearm will function reliably with steel cased ammunition.
I'll have to run a box through some "borrowed" firearms to chech it out again.