I used the Nosler 100gr ballistic tip in my .257 Wby Mag's, it was the bullet I started with, nowadays others might use something much newer, but... the Nosler 100gr BT just seemed to work for me in all the .257 Wby Mag rifles I owned over the years. In a well-balanced rifle for a younger hunter, sure the 7mm-08 Rem would be a fine cartridge for Elk, if she could handle that why not the .308 Win? Good luck... cheers