Pete is correct. Best to always seat and taper crimp as two steps.
I also do my roll crimping separate as well.
I use Lyman dies and their taper crimp dies exclusively except in the .41 Magnum loadings for a D.E.
For those loads I use a Redding taper crimp profile die for the crimp. It is an excellent die as well and am pleased with the chronographed consistency of the loads produced.
JT
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