John Barsness wrote an article in the last year or so about the 405 and loading it up easily to 450-400 specs. I think the super strong Ruger #1 action is the key, not the brass. I'd assume new Hornady brass would be fine, and the #1 can handle pressures that the Winchester 95 or a double rifle wouldn't. Barsness loaded 400 gr. bullets as I recall to duplicate the old 450-400 specs. bob