Daryl, I can't quite agree with you there about not needing to crimp. I would say that it very much depends on the cartridge and the magazine shape. On both my 338WM and my 458WM which are both in Model 70's, if I don't crimp then the projectiles particularly on the last round will be seated significantly deeper than where they started due to recoil.
I never use the taper crimp function in the seating die but instead use the Lee factory crimp dies which produce a parallel factory style crimp. After that I have no problems at all.

Matt.