I didnt think neck sizing would be the best way to go, as I am gonna feed them in a vintage WR double rifle and presumed that would be harder on the ejectors.

As I am gonna reload these cartridges to a friend so I thought it would be easyer if I used brass with correct headstamps. If making the the cases out of 30-06 where the way to go, could i then just buy a "RCBS Form Die 318 Westley Richards from 30-06 Springfield" and a .318WR seater die?

As for powders I am confined with Vithavouri N-150 & N-160 and Norma powders.