This looks to be a twin to my Lancaster Colindian gun. I wonder if the rifling is straight up to about 6" from the muzzle, or if the twist is uniform full length? My groove dia is also .730- I am loading 22.5 gr. Unique, hard nitro card, (2) 1/2" waxed fiber wads, and a newspaper disc under a Fosbery style .730", 750 gr bullet lubed with LLA, this in a 2 1/2" paper hull, garotte crimped. Accuracy is superb! Now- how to get you loading this?? I would send you some loaded, but obviously can't do that! I expect I could send some bullets though, if that would be of any help.
Doug