A heavy 12ga load here is listed as 3 1/2 drams black powder and 1 1/4 oz shot. A 3in shell may have room for extra wadding, for less shot deformation and a tighter pattern?
http://www.tbullock.com/bpsg.html
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 "Double guns are a sport and a pastime built into a beautiful package to which I attach myself when entering the great theater of autumn, those days now grow more precious because we are given so few".. Robin Lacy
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