Max brass OD (with bullet) should be considered to be chamber dia. minus clearance (usually 0.003" min.). Outside turning of the brass is usually the preferred method for reducing brass thickness and uniforming. For accuracy, most prefer a handheld tool. Reaming is good for bulk metal removal and the elimination of donuts as they form. With your specs, a neck thickness of 0.015" would be close.
It appears that your calculations do not allow for two thicknesses of neck metal.
Last edited by Winchester 69; 03-24-2008 at 11:27 AM.