Are you using the correct seating die? Iv seen it mildly when loading dummy rounds to look at over all length and just using any old seater example using 6.5 creed seater to seat a 7mm projo always comes out with a ring I think you usually get it with long pointy projectiles with out vld or eld seating stems but that’s obviously not long nor pointy maybe try swapping out the seating stem or run the brass over and expander . Is force required to seat ? Is it “popping” when lowering the press back down? When I have seated dummy rounds with the wrong die iv noticed it seats smooth but you feel it pop back out of the seating steam
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