So a preliminary report. I had my 6ARC barrel opened up to 6mm CM everything same except chamber. Got a couple of rounds through it at last light today. With the sam 103 gn ELDX Velocity had moved from 2880 (and a very hot load) to 3010 ( albeit max) with no pressure signs at all. The expense - an extra 10 gns of powder. Never as much as yer hope for but usefull none the less.
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