Some let you roll the crimp into a crimp groove, some don't. The main thing is not to let the roll crimp push the bullet deep into the case, as that quickly increases pressure. The small available powder volume under the cases means the small recommended charges, such as the old standby of 2.7 grains of Bullseye, need to be adhered to.
I prefer to use a taper crimp with these loads. Unless the gun you fire them in is a feather weight, the recoil won't be enough to pull them. The taper crimp extends case life because it works the mouth less dramatically. If you seat the bullet about 0.020" out beyond the case mouth, it will bite lightly into the lead prevent seating too deep, and also prevents pull at the light recoil level these loads have.