The .243 is a great round there is no denying that but unless you hit an Elk absolutely perfectly at that range there is no way on Earth that it would work.
Ive been shooting for a long time and consider myself to be a decent shot but I couldnt make that kind of a shot. If I can't make it the chances of a kid making it arent very good. Unless this kid is some kind of boy wonder I'm gonna call B.S.
I love the smell of fresh shotgun in the morning.