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Of the two Pietta .44 Remmy's that we shoot regularly both have different spec chambers and grooves.
If the chambers on both are reamed to .450 or .451 that will put them both at or just over groove diameter within the desired spec of .001-.003. Chamfering the mouths of the chambers then would probably allow the use of .454 balls but would probably go with .457s.
Doing this work increases pressure which in turn increases velocity and makes the guns more accurate. Would also like to chamfer their muzzles and cut the forcing cones to 11 degrees.
This work was done to a .36 revolver and its a tack driver.
That being said, if I had a gun like Steve's, I'd leave it alone and tinker with another.
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