It is my opinion that, in a double rifle, the 470NE is the most sought after chambering for African hunting, and in older rifles one pays a premium for a double so chambered! As stated, the fact that good factory ammo is responcible for that choice more than effeciency. Any of the .458 dia NE rounds will do anything the 470 NE will.

However, I believe the most commonly used chambering in a double rifle, world wide, would be the 9.3X74R,followed closely by the 7X65R, especially in Europe.

I use a 500/450NE most often in Africa, though I have other suitable big bore doubles for the big five. Lately, in the USA, my favorite rifle has become a little 8 lb 9.3X74R double rifle, and it will go to Africa the next time I go there. Here in the states, I rarly use anything else!

My choice of chamberings, if I had to cover everything,with doubles, they would be a 500NE, a 450#2, a 450/400NE 3", a 375 H&H flanged, a 9.3X74R, and a little 16" barreled 30-30 Win with a single selective trigger.