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Old July 5, 2022, 10:04 AM   #14
Join Date: March 4, 2005
Location: Ohio
Posts: 20,209
Calculation by constant cross-sectional area suggests the neck brass would grow in thickness by 0.001". However, in the actual forming, a portion of the brass moves into increased length rather than thickness, so the actual change in thickness would be expected to be less than that. It's not really going to be a significant difference. If you want to, you can outside-turn the necks down 0.001" before sizing them down. This will reduce both the thickening and the lengthening, but, more usefully, will result in more uniform neck thickness in the finished cases.
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