i don't think i'd have any trouble with any 240gr bullet out there. i also think i could kill a whitetail deer with any bullet fron 180-240gr. the 240 may give some insurance of full penetration.
i have seen a 180gr xtp in a muzzle loader penetrate a button buck full length with a front on shot, to rear quarter under the hide.
i need a little more testing, but i believe the 240 xtp is gonna shoot a little more accurately than the 200 xtp in my 14" 44mag.