Originally posted by Genepix
Just curious about the 66 being the first S&W stainless magnum. My 65-5 is stainless as well- could that have been a transitional production period?
The M65 was introduced in 1974 while the M66 was introduced in 1971. S&W does not always introduce model numbers in numerical order. While the M66 was the first stainless magnum produced by S&W, it was not the first stainless handgun. That distinction belongs to the M60 which was, IIRC, not only the first S&W stainless revolver, but the first stainless steel handgun produced in significant numbers.
Originally posted by sibur
This gun is not in pristine condition, I would say it is good to very good condition. There are some scratches, the clylinder locks up tight and it indexes fine.
Minor nicks and scratches don't hurt the value too much unless you're comparing to an unfired revolver. Generally, people are more tolerant of such cosmetic blemishes on a stainless gun because they are less noticeable than on a blued gun and can often be polished out if they're not too deep. Much more important is the mechanical condition such as timing, lockup, and the condition of the forcing cone.
One thing to bear in mind about K-Frame magnums is that, while they're great guns that can give you a lifetime of service, they are not tolerant of magnum loadings using lightweight (less than 140gr) bullets. K-Frames are somewhat unique among S&W revolvers in that the bottoms of their forcing cones must have a flat spot milled on them in order to allow clearance for the yoke when the cylinder is closed, a feature not shared by other S&W frame sizes. This makes the forcing cone weaker in the six o'clock position, but still plenty strong enough for .38 Special ammo and the 158gr .357 Magnum ammo available when the first Combat Magnums (Pre-Model 19) was introduced in the 1950's.
Fast forward a few years to the late 1970's, however, and someone came up with the idea to reduce the bullet weight to 125 or even 110gr and drive them faster. While these loadings did display impressive terminal effects, the lighter and thus shorter bullets allow hot gas and buring powder to 'leak' around them into the forcing cone. Also, less pressure is required to push the lighter bullets out of the case so more powder burns in the forcing cone and barrel and less in the case than a loading with a heavier bullet.
The result is that when K-Frames are fed a steady diet of lightweight magnums, they can sometimes experience excessive erosion of the forcing cone up to and including cracking at the six o'clock position. Because of this, the use of magnum ammo in a K-Frame is best restricted to loadings with bullets of at least 140gr. While that may sound like a pretty drastic design flaw, it really isn't. Remember, lightweight magnums did not exist when the Combat Magnum was designed and I don't really consider it to be a design flaw when a gun has problems with ammo it was never designed to fire. Also, you're not really sacrificing all that much by sticking with heavy bullets anyway as several excellent .357 Magnum loadings with heavier bullets are available such as Remington 158gr SJHP, Federal Hi-Shok 158gr JHP, Cor-Bon 140gr JHP, and Winchester 145gr Silvertips. Also, a K-Frame magnum will easily handle any .38 Special or .38 Special +P loading you like.