light 20ga is a great upland gun but a 12ga is more cost effective to shoot.
20ga steel if you can find it is OK, did I just say that
If he is 12 consider a light 12ga (stock cut to fit and shorter barrels) if he can manage it OK and find some 24gm trap loads (yes steel) if 25 to 30 yards is you max range they should work OK
Other than that .410 will be fine for what you want at those ranges
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