brass prep

[buzzard]

You know how carefully we fit bolt lugs! to keep the bolt square on the base of brass well I just noised a raised place on the base of my Lapua brass after fire forming and I have been working it flat with a die makers stone have any of You seen this cause a accuracy problem it is the ejector plunger hole that makes it. Need advice.

 

[Fido]

It sounds a lot like over pressure to me.
The brass will actually flow into the ejector hole if you are running too high a pressure. I would load some lighter loads and see if you still have the mark.
Stephen