Without going off topic too much, just wondering how many Stags you have shot? and if you have shot any with a .243 and if you have shot any with a .308 ?
I'd not recommend shooting the big boys with the .243" you are simply just under gunned IMHO, yes if you hit the spot you'll kill the beast but compare the results with that of a .308 and believe me, you'll not bother with the .243.
It amazes me how many people are hung up on the .243" as if they haven't got anything better to use, the .243" is just deer legal and most have a twist rate not suited to heavier bullets as in reality the .2