there are a couple 30 caliber rounds that haven't been brought up that could do what you want. the 30-378 is the most powerful 30 caliber bullet, but is also quite expensive. the 300 ultra mag is not far behind the 30-378.
do you have any bullets in mind? I like the Berger VLD. Berger makes a hunting bullet, and I think a target bullet.
no reason to go that out of control sounds like the .308 will do everything he wants.
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