18" Proof Research - 6mm ARC build and testing - factory and handloaded ammo

[Lemonaid]

I've had that happen in my 6.5 Grendel (bullet moving forward during the chambering process). Using a crimp die helped shorten the jump but to get it to stop the amount of crimp put a groove in the bullet. I polished down the sizing die expander a thou for more neck tension and that seems to work.
For factory ammo you would think they would have this solved before selling them? They need your feedback to make better ammo.