That is one beautiful revolver. We had a thread a while back about a .50 caliber revolver and I contacted a few modern revolver builders about it, but they weren't interested. Said that there was no market for 'em.
A long time ago, a group of us experimented with different rammer face profiles. We came to the conclusion that for balls, a flat face was as good as anything else. As long as the ball was seated below the cylinder face and down on the powder, the flat faced rammer left the least marking on the ball. As for conicals, I have never been able to get them seated squarely on a regular basis. Maybe a slug with a longer shank area would be the way to go-along the lines of a wadcutter.