If I was shooting camels again I'd take the .375H&H and load it with flat shooting 260g NABs. Anything from the 7mm 160g would probably be effective but I can think of better things to do in 40 degree heat than chase up blood spoor on a gibber plain.

As for anatomy, just remember the spine lies dorsal in the neck - a broadside shot to the centre of the neck can severe the windpipe and nick the blood vessels without breaking the spine

Just what you need when being watched and expecting it to drop on the spot