Years ago a really good gunsmith friend of mine round-butted a couple of Smith revolvers for me. Was not a lot to it.
He mounted a set of Smith two-piece thin wooden grips, traced around the edges of the wood with a scribe, removed the grips, ground the grip frame almost down to the scribe marks, filed and polished away the file marks, sharp edges, etc., and I think did something with the hammer spring tension screw ( I could be wrong on that ) and was done. I think it took him less than 2 hours for the whole operation.
Have been shooting both guns a lot for the 25 years since the work was done. No problems.