Well, you didn't specify what chambering you're looking for... however,
the medium K-frame can be lightened a bit with it's leaf main spring. The smaller J-frame with it's coil spring can't be lowered too much just
smoothed out.
FWIW - I had the Master Revolver Action Job performed on my N-frame
625 - very smooth, DA, and SA is light like the proverbial break of a glass rod.
that is a $140 action job, including the trigger, and polishing internals, as well
as chamferig the chambers.
A used Model 18 in .22 LR or a Model 15 in .38 SPecial are great
both having ramp front, adj. rear, and polished blued carbon steel,
\with the small wood grips conforming to the square butt frame, on the
used market $400 and up depending on condition. OR if you go
to the MOdel 19, it's a .357 Mag. you can fire the milder .38 SPecial in
same format as the 15 w/rear adj. sights.
The new offerings the Model 18 and 17 clasics are even more than
the 617 stainless steel model that is $800+ msrp Glad I got my
617 2 years ago for $625 - but it's a keeper it's just so FUN to shoot.
unlike the older 6 shot models the 617s are now fitted with
10 shot cyl.
Randall