The shop that sold me my gun sold me a .451 mold which they said was correct for it and I cast up a bunch of those. I found it took an inordinate amount of effort to force them into the chambers and they shaved off a veritable O ring of lead from the ball. I only fired two cylinders worth of those and they were all over the paper, so I started using .445s I had cast for the Numrich instant muzzle loader and the accuracy improved dramatically. From a bench I can keep all the shots in a six inch circle at fifty feet, but of course, nothing like that offhand. I'm convinced the gun can shoot way better than I can. My vision isn't all that great, which is why I had to give up flying.
I went in the basement this morning to look for my BP shooting kit to confirm some of the claims I have been making.
I know where the range box should be but I can't get to the shelf to look because a lot of stuff got piled up in front of that shelf when we had some construction done a couple years back. It also doesn't help that my Daughter's stuff is also there now that she has moved back in after graduation....
Because I cast most of my own bullets, I haven't bought commercial cast bullets except in a couple calibers in a very long time.
I suspect you are probably correct in that the proper diameter of round balls for the ".44" cal revolvers is actually .451 inch and not .454 that I was remembering. I also suspect that I am misremembering whether or not the 200 grain Lee SWC bullets I cast were sized or not before use in the revolvers. That would make the proper diameter of bullet to be .451 - .452 inch instead of the .453 - .454 inch that I had posted earlier. I know that I wasn't shaving any lead from the 200 grain SWCs in loading. That would have been not so easy anyway because they were fairly hard wheel weights and not pure lead. I also know that they were seated so the noses were just about flush with the cylinder and that they didn't back out under recoil because that would have prevented cylinder rotation and jammed the gun.
I didn't bench test these revolvers much because they tend to leave an amazing amount of residue on the rests but I did test them enough to be certain that the 200 SWC was no worse in accuracy than the normal lead round balls which were about 160 grains or so and that both were pretty comparable in accuracy to a typical cartridge revolver load (2-3 inch groups if everything was done right).
At the time my eyesight was a lot better than it is now and off the bench, I was able to get sub 1 inch groups if the gun and ammunition were capable such as with a tuned M1911 .45 Auto or a .22 Target pistol.
I don't recall if I still have any of the chronograph data written down, but at the time I thought it was interesting that these .44 cal revolvers were pretty much the equivalent of a modern ,38 Special.
I am still suspecting the cylinder bores on your revolver are a bit too tight.
- Ivan.