I'm probably a little less concerned about it than your guide is
. If you can't haul all that meat home in the back of that PT cruiser let me know........I'll lighten your load a little pardner! Sounds like fun.
Well, if I have to struggle under the load, I'll call you first
Meanwhile I figured Ive killed a few elk, and a truckload of elk sized African game with the 7x57 ( aka .275) so I have no hesitation using it with a good bullet on Nilgai.