Back in 1976, I bought a 1962 era M27-2, blue 3 1/2". It had a little light freckling on the frame, near the rear sight. I bought it to convert to .44 Special. i shot before the conversion, using the standard lead .357 Magnum ammo that was most common back then. After 50 rounds, you could barely tell the barrel rifled, it was leaded so badly.
I got a factory 1950 .44 Special target barrel from J&G Rifle Ranch and did the conversion.
I've never looked back. I realize I destroyed a "grail gun" for many folks, but I don't care. After the conversion, I had MY grail gun.
Now, that said, I would sell that pre M25 and convert a M625 to a Jovino, if that is what I wanted. Back in 1976, there were fewer choices for conversions.