Pure conjecture NOT based on experience but if I had a favorite Elephant Double I would have to agree with Mickey and I believe Marrakai who believe that the 577 Light Magnum with the 2 3/4 case as a primo candidate.A 750 grain solid at 1850 should penetrate well and have major smack as well.

The recoil should be similar to a 500 NE so I would think you could build such a Double in the 11 pound range and carry it all day.

Lacking a 577 I will be happy to use my 500 NE without complaint.If I do my part shooting dead is still dead.