I have been told that 45acp cases can bve made by cutting down 30-06 or 308 win. cases.If this is so it would seem reasonable to believe that those same cases could be expanded out to make a extra long version and headspace being set the same way.Is this correct?I just thought it make an interesting alternative to the belted magnum case or trying to get a bolt gun converted to handle a rimmed version such as the 45-70 in the siamese mauser as was done by Navy Arms a few decades back.Especially for those of us left haded shooters who would like to use a bolt gun but don't want to go the belted route;such as a 458.