Personally, I'd toss the Lee FCD, and for that particular bullet use a taper crimp die. The post-seating-sizing die has a tendency to swage the lead bullets and reslt in poor accuracy and leading. If you want to use a roll crimp, crimp over the shoulder. I would think if you tried to crimp into the top of the lube groove, it would have to go pretty deep to contact an metal to hold on to. Seated above the lube groove with a moderate taper crimp and the loads you suggest, you'll be fine...