Whats a good gun to buy my 15 year old son?

Im looking to buy my son a rifle for his first gun, hes already shot high caliber rifles like a 308 and a 44 revolver but i want to get him a decent rifle and im willing to pay arond 350 usd im thinking of a 22 or other small caliber and either a semi or bolt rifle if anyone has a suggestion please let me know.
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