Final update- For some time now I have been following Ross Seyfreid's advise. Fed paper hull trimmed to 2.5", 22.5 Unique, nitro card, 2 hard waxed 1/2" wads, 750 Fosbery style bullet cast at .730, LLA lube, and garotte crimp. This is close to being the most accurate double I own! I can consistently hit a bowling pin at 100 m. offhand both barrels! Though not many times- not a lot left after 10 or so hits.
Best, Doug