Oddly enough, at present I have 3 45ACP perfection seaters.
All three appear at first blush to have been designed for RN, 230g bullets.
However, when I took one apart, there was a considerable amount of lead slag
that was HIDING the shoulder seating surface.
There was some much lead and lube, that the shoulder seating area was
hidden by the accumulation.
I cleaned this accumulation away with a dentist's tool and there you go...
shoulder seater was there all along. Just hidden. On all three.
Maybe I am lucky? I shoot 100% LSWC's which I cast from a H&G #68 FB 6 banger mold.