If a 30-30 has enough power for him, then a 250-3000 or 300 Savage will also have plenty and be a lot less kick than a 30-06 or 308. There's been 300 Savage factory ammo available lately, so might try make sure he can get several boxes of that if you have a gun to sell him.

“The Savage 99 Pocket Reference”.
All models and variations of 1895’s, 1899’s and 99’s covered.
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