Taper crimp is used by many, and I have tried and retried and always came back to roll crimp. Two things, worked better with speed loaders and when taper crimping have to make sure using same head stamps due to wall thickness differences and degree of tension can vary even with same head stamps. With me was not getting the degree of accuracy with the taper crimp I got with the roll crimp. I have tried varying degrees of crimp and always came back to the light roll crimp. Factory loads I have heard a taper crimp die, but almost look like a roll crimp The Redding profile crimping die was supposed to duplicate this type of crimp, tried it too, but never noticed a difference of any increase in accuracy at 50. Found the old Lee factory crimp die works as good as any of them even though their Barnum and Bailey/Herters approach to their advertising did nothing for me, but their dies work pretty good
I like you had a some custom expansion dies made up by a machinist in about 3 different diameters for different bullet diameters, but didn't see anything that was any more impressive in what I settled on. This is just my experience with my guns.