Here's a favorite of mine:
RP Nitro 27, STS, Gun Club hull
WW209 primer
18.5 of Clays
CB1100-12 wad
1 oz. #6 hard shot
1235 fps
Another:
RP RTL or Premier hull
RP 209P primer
21.0 of Green Dot
RXP12 or R12H wad
1 1/8 oz. #6 hard shot
1230 fps.
The Clays load burns clean and is a good all around reload. The GD load patterns tight for longer shots; comes from Lyman shotshell #4. CB