In any of my Super Mag calibers, the best crimp I found was the Redding Profile crimp die. You can adjust it were you don't have as much crimp, or tighten it down. I've had a few bullets pull out and tie up the cylinder on a revolver with regular crimp dies. If you look real close at factory ammo, they use a taper crimp on auto cartridges,(9mm,.40, and 45,etc) And a hard roll crimp on the bigger magnum stuff.(.41 and .44 mag.) gypsyman