RCBS small base dies?
Pulling the bullet and using the brass of factory is not a bad idea! Also I searched this forum for the RCBS small base dies and it looks like that may work. Hope they are not too expensive.
As far as the other comments on the caliber, yes it is 308 and yes it must have been done in the 50's since the rifle action is from 1891! The new barrel is shorter and not "stepped" like the original military barrels. These rifels are quite commen and a lot of them were converted in the 50's to make them more sporting.
Will look into the small base die. The problem I have with measuring the cases is that I only have a caliber and beyond overall lenght, thinkness it is hard to measure the case that precisise. Especially measuring the neck is tough with out a more elaborate setup I think.