BP lists two wads that might help. The Stretch 36 which holds .5 to 11/16 oz and the TPS. The TPS is the one I told you about in a PM. I barely got .5 oz of lead 8's in it so 1/3 of the load would be above the wad. The specs on the Stretch 36 don't appear to be better than the TPS as it's depth is less. The TPS's depth to gas seal is 1.8" and the Stretch is shorter.
I have experience with 13/16 oz of tungsten shot in the TPS and note that even though the load is to the top of the wad, the shot imprint on a fired wad is only 2/3rds the length suggesting (to me, anyway) that there is considerable set back on ignition driving the shot deeper into the cup indicating the same may occur to lead shot outside the cup in your loads as it presses into the plastic down and outward. Gil
