In the 70's and 80's I shot a lot of steel cased Russianicon ammo from the 1930's that the Finns had captured and then surplused off in the US about 1960. It was all steel cased, copper washed, and had no difficulties with extraction.

With all the surplus I've seen since 1995, the brass cased stuff is no problem, and the only rifle I can get the steel case to freely extract from is a new-condition M39.

Buy some Bulgarian, try to find some Albanian, or maybe get some brass-cased commercial, and your problem will go away.

CDD