As some have stated here, youths and ladies are using the .243 ( men too) to suggest a larger bullet isn't fair as the only youth rifles I can find are either .223 or the .243. It's by far more important that the rifle fits you to shoot proper than size of the bullet. From what I've read in magazines and onn this board the 7mm-08 would be the perfect choice for ladies and youths ..... once the manufactures chamber youth rifles in it.

I'm sure a .243 held correctly is more deadly than full size model 70 chambered in .300 Win Mag held like a pistol