An update- first, I apologize not having taken pics- will try to get to that! It seems there is no choke as previously thought, just forcing cone in front of the chamber. The groove dia. has been verified as .730 at both breech and muzzles, straight until the last 6" where the twist is. Metford style rifling .005 deep. Interesting- the barrels are actually swamped in profile!

So far I have been using .735 dia fosbery style bullets, since that is what I have, with no success. Groups are non-existent. Yesterday got a push thru die made in .729, so will try that size. Will also try different alloys. BTW, the powder charge has been from 25- 28.5 gr Universal Clays. Any advise would be appreciated!

Thanks, Doug