410 would be my choice for your situation. Youy need to be a better shooter to get the same result as a 20. In the long run, you will make him a better and more selective shooter. Being able to kill anything at any time does not make you necessarily a better hunter or shooter.
And in my book, everyone needs a 410 in their inventory of shotguns.
Duke1
And in my book, everyone needs a 410 in their inventory of shotguns.
Duke1