Off the cuff, I'd think slugs would be more effective than any shot, except maybe while walking and at very close range. Just a guess.
It would be wise to try him with both "hot loads" and standards, remembering that y'all need to use some padding if shooting from a bench rest. Don't get him into flinch mode. The perceived recoil when shooting from a stand is much less than from the bench.
FWIW, Art
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