Gryphon

Sounds like a necked down .416 Chatfield-Taylor - which is a semi-wildcat of the 458 Win Mag necked down to .416.

It reportedly is not far behind the H&H magnum in terms of velocity.

In a shorter action sounds like a very nice rifle/calibre combination.

Check out this link for more info

416 Taylor page

Thinking of buidling one?