Okay then, I finally got the 2 ball loads put together.
I loaded up 10 in CSD wads with paper wraps to snug the balls up some and 10 loaded up in Uniwads that Hogtame sent me to try for round balls. I didn't get very good results with round balls and had some left over so they are getting used now. The CSD wads are perfect depth for two 0.600" balls but slightly large diameter. I want to keep the RB's lined up so used some paper wrap to do it.
The Uniwads are a bit short and also slightly large diameter so I used a wrap of old shogun hull cut to suit and slightly longer than the shotcup.
I used 2 3/4" Federal plastic hulls with paper basewad, federal 209A primers (all we can get here right now) and 29 grs. (Lee dippers) of Blue Dot. This seems like a safe and sane load from researching heavy shot loads.
Now when the weather warms up just a bit I'll get these tested. Probably in a week.
Longbow