Brians356
Gold $$ Contributor
An approach to comparing body diameters of virgin cases: Measure, say, approximately 0.2" from the base up the body of a Winchester case, and make a mark there with a sharpie. Clamp the caliper on the body at the mark, and lock it at that setting (ignore the measured diameter.) Now move the caliper, still locked, to a virgin Bertram case, sliding it down from the shoulder towards the base until it wedges, and mark where it stops with the sharpie. A very slight difference in body diameter will change the mark's distance from base noticeably compared to the Winchester case.brian356, I didn't ignore your suggestion to measure and compare. Ive been at work since 6am and just got home hour ago. the necks are longer on the bertram brass ONLY after fire forming. Before fire forming the brass are 2.090" after forming the Bertram brass comes out to 2.095 to 2.100". I think you might be right about the brass being undersize. Ill check tomorrow and get back. Thats the only thing that makes sense right now
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