I've always got best accuracy with belted cases 2 die sizing them. First die sized only the body all the way to the belt. Second die was gelded sizing only the neck and set the shoulder back just enough to let the case headspace there centering the bullet and neck when the firing pin impact pushed the cartridge to its limits. 20 shots inside 5 inches at 1000 yards in each of two tests.
For ME, every bottle neck cartridge I have reloaded has always given the best accuracy and longest case life by neck sizing only after initial firing. 10-20 reloadings not uncommon