I’m fireforming for a 6 mm Dasher out of Lapua 6mm brass using 88 grain Bergers with a flat base. I figured they had more bearing surface and would slip less in the case than boattails. My problem is if I use CCI 450’s with the bullet jammed 5 thousands only half of them go off. I also tried Win small rifle primers which all go off but half of those pierce the primer. This is for a no turn neck chamber. Which primer would possibly fall between these two in hardness or easier ignition without piercing. Wasn’t sure if CCI 400’s may work or would they pierce as well.