I am working on chambering reamer and resizing die dimension for a .375 Chey Tac based cartridge. Wall thicknesses are running about .014 to .0155 thick at the neck on a 10% sampling I mic'd. I intend to neck turn the brass to a fairly uniform .014 which gives me a case neck OD of .403 to .4035 with a 350 gr. SMK bullet seated. I am considering resizing die dimensions of -.0024 from chamber dimension at the base and a -.0035 sizing die dimension at the shoulder and .0035 sizing die dimension at the neck. I would like to hear an opinion on those clearances if anyone has one. The variables I am concerned about are brass springback and net clearance. if I cram brass into a hole that is .0035 smaller than the chamber what will I have as net clearance? For instance, if I assume .001 springback I would net .0025 of .0035 and is that enough in the neck area? Accuracy is a primary concern but I don't want a bullet that doesn't fit in 30 degree weather. Guidance is greatly appreciated.