I thought the Bulge Busters were used on brass only, sizing them down to the same size as a conventional sizing die, sizing them all the way through to insure they get sized all the way down to the rim.
The Lee carbide Factory Crimp Die's internal ring is larger in diameter than a sizing die or a Bulge Buster. Large enough to ride over a bullet without swaging it down, but small enough to help remove any bulges left over from seating.
I would be concerned that the bullets would get swaged down too small if you ran completed cartridges through a Bulge Buster.
Maybe I have it backwards.
Check with Lee, prolly on their website.