I just loaded up some 45-70 handloads using 46 grains of IMR 3031 , a CCI 250 mag primer and a 405 grain Remington bullet. These are for a Browning 86 carbine.
Anyway,,,, I first tried a taper crimp die and it looked good but it allowed the bullet to move back some. So I tried the regular roll crimp and it is making some wrinkles arund the case. So I seated in one step and then rolled crimped alone. It still made some wrinkles. THEN, I tapered crimped and then roll crimped.... It helped some but still has some odd impressions on the case. I loaded them to 2.65 OAL.