I worked up a load of 35.3gr imr 4164, vmax 87gr in once fired ppu brass and It shot. 0.34 moa with no pressure signs and 3025 on the chrono so I made 60 rounds up.
Shooting today I had heavy bolt lift and the little crescent on the brass.
I did notice the coal shifted from 2.625 to 2.619 (using Lee hand loader). So I wonder if that is enough to make a difference in pressure.
The groups are fine so is it safe to continue shooting the rounds?. I have put 10 through and not all show signs of pressure, maybe 50%.
This is a group from today's practice.
The ppu has been fired twice now, does anyone know how many shots I should expect it to be OK for?.
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