buckstix,
My late friend Gene made .318" bullets by "bumping up" .308" bullets in corbin dies(he had a Hydroswage(?)press). He had problems with the last batch he tried. I found it more convenient to size them from .320-.321" 32Win. Sp. bullets. Loose jackets are the reason for the .005" limit "rule of thumb". I bought the .318 Corbin die from Genes family, but couldn't afford the hydraulic press or .358" dies. I did buy a broken Corbin "H" press from them and repaired it.
Mike