Steve, folks not crimping their case mouths on bullets can shoot 'em into sub 1/3 inch all day long from properly rebuilt AR15 platforms. I think you're doing something wrong putting together your uncrimped rounds.
Nobody winning benchrest or high power matches with a bolt gun or semiauto service rifle does so with crimped in bullets. Neither Berger nor Sierra Bullets crimps their bullets in cases that will be used for quality control, do they?
Take your cause to
www.accurateshooter.com and convice those folks to start crimping their bullets in place.
Most of the naysayers concerning the Lee Factory Crimp die have rifles and load ammo that shoots groups 1/4th the size of those you posted.