CHT,
True. The Henry, the original '66 and the Open Tops were all .44s. Closest approximation is .44 Russian.
Any way we get to the desired result is ........ correct. Since we can't shoot originals, "almost" has to be the goal. I'm eventually going to have the Coal Mine Shaft chamber cut out of my 44 Special 66 and have a sleeve made with a 44 snug 44 Russian chamber with a throat to the rifling. It just galls me to no end I didn't try the thing before I built it as a Trapper. Oh well. Some days you eat Bear. Others, the Bear eats you.
Would also have helped if I'd made the discovery "before" I sold my lathe. Some days are simply Diamonds ............
Coffinmaker