It may depend ion which rollers action you have. I had a Navy Arms in 45-70 once and had to trim the face off the hammer a tad to get really heavy pills into it. Ken Waters discussed this a bit IIRC. Bullet selection plays a role as well. Shorty's work, but that Lyman 462560 won't go. Too much nose. Great shooting bullet. Hope that helps a bit. There are limits at least in that gun/action/caliber. My original 7mm seems to take anything. My Danish (?) in pseudo 47-70 seems to take about anything, but I not loaded a full spectrum of bullets as the twist is about 1 in 36. I got a kick out of some of your responses. I can't speak to all rollers, but the Navy arms in 45-70 does have limits.