It isn't really surprising that the roll crimped loads are getting al least as good accuracy, even though they deform the bullets. They will have more consistent bullet tension. The consistency you gain from that will override any problems created by bullet deformation. Bullet deformation in lead bullets is usually ironed out while it is travelling down the barrel anyway. Bullet deformation also doesn't cause as much of a problem as people think anyway. You aren't losing bullet weight, so it shouldn't change point of impact. If you ever get the chance, check out the Mythbusters episode on curving a bullet. It's amazing what you can do to a bullet and it still fly straight!