Here's one I like. You can bump the powder charge if you want a little more velocity.
Federal paper hull
Win. 209 primer
1 oz magnum shot
windjammer wad
18 gr clays powder
5800 psi, 1180 fps
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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