The 378 and 350 from the 405 looks easy enough.... On the other end the 257 looks like a pretty good jump... Does it size easy in one step? I have a bad memory of trying to make 256 WM from 357 brass.. I'm thinking I'll be holding at least a 378 GNR and 338 GNR size dies so taking the neck down in steps will be easy enough.. Might be just the excuse I need to buy a 350, 8mm, 310, and 280 GNR...