Dave, Here's what I've been useing in my 16ga DH.
Cheddite Hull
Win 209
DR16 wad
16.3 gr Clays International
7/8 oz #8 lead
1175 fps 6700 psi
Nice load thats murder on clay targets.
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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