I got some of those Track of the Wolf conicals as well. I have an Uberti NMA which takes a .454 round ball and could probably take a .457 ... I was concerned they were too small but I tried placing one in the muzzle just to check size and it seemed ok mostly ... once it’s lubed and in paper I’ll try loading & firing one.The chambers on Pietta .44's are usually around 0.447"-0.448".
0.443" and 0.446" sizers are what I use to make bullet bases to slip into the chambers.
On a side note, some guys ream the chambers to get the ball size to better match the older Pietta barrels.
But wouldn't it be a better mouse trap just to replace the barrel?
In manufacturing at Pietta they've changed their barrels to a faster twist to give better accuracy. For the older revolvers why not just get barrels with a 0.447" groove diameter and a faster twist and length of your choice?