.338 is I believe and stand to be corrected, below the minimum legal in most of Africa for Buff. That being .375, the exception being 9.3 x 62. You certainly can kill anything with a .338 as you can with a 7mm but it is not recommended practice.If the shit hits the fan you will be undergunned for stopping a charge. If the cost of ammo is a issue then a .458 win mag would be the logical solution.

Regards