Anyone responding to this post ever use reloading manuals? I have owned 2 460's and still have one.
It is NOT NECESSARY to load to "factory" specs! I load mine with 500 gr. bullets to about 2350fps. About the same recoil as a 458 Lott. It surpasses the Lott in performance and while the Lott is pushing max pressure to get that velocity, the 460 is not even "breathing heavily".
Brass lasts a long time at those velociities also. The same holds true to the 416 Wthby. It is nothing but a belted Rigby with a different shoulder. Load it to Rigby specs and guess what...you have the duplicate of the Rigby........a great cartridge. If you like the way the Weatherby looks and feels, get one. Then reload and remember there is no law or rule that states you must load it to absolute maximum. Really...I wouldn't lie about something like that!!!