folically C: I too have experienced, 2 I believe, old 70s vintage RCBS dies that apparently were just incapable of producing straight ammo. In one case, they did an exchange for a new one and the new one was MUCH better. Actually I've had problems both in the sizing and seating re: concentricity. I think most common wisdom has been that most concentricity issues are from sizing, but my experience is with both. With the last go-round, it was with seating, and that was using a Forstner bench rest seater, BUT, after a bunch of trying different things, it ended up being with the brass. New starline brass came out just fine.
