of all the silly things I've done to make Match brass over the years the one thing that is important is neck tension as Ram noted.. the best way to get uniform neck tension is to sort your brass by uniform neck size... I use the RCBS Concentricity Gaging Tool. you can measure round run-out as well as neck uniformity
http://www.midwayusa.com/product/310955/rcbs-case-master-concentricity-gaging-tool
everything else is pretty much just being anal after you get the right load and OAL
http://www.midwayusa.com/product/310955/rcbs-case-master-concentricity-gaging-tool
everything else is pretty much just being anal after you get the right load and OAL
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