Well, seems like an easy enough choice then, if you make one lead-up decision.
Do you want to have the best chance of a successful hunt or is it more important to be "different". Nothing wrong with either choice, you just have to make it.
If you want the best chance of killing an animal, the 243 is the obvious choice. If you want a good story, adventure, to be "different", and the reduced odds that come with it, the 1903A4 Sniper seems like the most obvious choice, IMO.
Still happily answering to the call-sign Peetza.
You do not HAVE a soul. You ARE a soul. You HAVE a body.
He is no fool who gives what he can not keep to gain what he can not lose.
-Jim Eliott, paraphrasing Philip Henry.