Awful leading was always something that happened to other people...until now.
My recently-purchased New Century (TL) has a bore that runs from about .4315" in front of the forcing cone down to .431" at the muzzle and throats of .432". Timing looks to be extremely close, I cut a brass rod at a slip-fit for land diameter and felt no hitting or binding on the throats when locked-up, even when pressing the cylinder against it's stops.
It leads like crazy using the .430" bullets I bought before measuring throats and bores.
Yes, I *could* buy some molds and fool about with casting projectiles, but I have enough trouble finding time to go to the range and reload as it is, so I'd just as soon throw a little money at it and move on with my life.
It's a target-sighted gun, so bullet weight isn't a critical factor. In a perfect world I think I'd like to find a Keith-style SWC in the 200-220 grain weight, but really I'll take anything that fits and groups.