I would say an elephant specialised or perfectly suited for elephant double rifle, is not an "all round" double rifle. It's at the upper end of the range.

Surea .577 is the ideal elephant rifle, or a .500, but it's hard to say a .450 or .470 is allround.

But as you say it depends on definition. For me, it's for everything from warthog, duiker, impala,to eland, buffalo, elephant, so a compromise. Capable of some accuracy and distance,but also capable of being used up to elephant. But not specialised for elephants. A difféent answer showing variation of opinions. Thanks.