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Many years ago I was reading on MountainMolds.com about Dan’s excursions in high velocity and he was useing Win 748, so that’s what I started with. I have some RL-17 that should lower the pressure and should be easier on the bullet. I’ll try some in the same velocity range with it and see what happens.
Given the off brand nature of my ’06, Mike suggested that I measure the twist and see just exactly what it was. I measured it 3 times and came up with 10.5″ .