I agree that starting a kid too young on a gun with too much recoil is likely to create bad habits that will limit or end his enjoyment of the sport and will last for a long time.
That said, there is a good article in Handloader Magazine No. 279 (August, 2012) that not only gives some good 1/2 oz 20 gauge loads, but it also explains how they were developed from 7/8 oz load data.
SL1
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