How much interference fit is there when you seat a bullet? No expander in my RCBS 308 FL die is perfect for WW brass, but would leave the neck way too small for Lapua or Federal.
It's Remington brass and none of the bullets seated like there was excessive tension on the necks.
I would try a Speer 87 gr and see if that works AA 2520, RL 15 or a good mid range powder should work if that does not you may have other issues. What twist is the barrel ?
They were 87 grain Speer, my first post was a typo on the grain weight. The barrel is a 1:10 Pac-Nor feather weight.
