I own; one Python, one Dan Wesson, one mod.#13, one mod.#19, two mod.#66's, I favor the K-frames [they're all 3'' w/pinned barrels and 3
screw frames]. Before you try to find the 3'' K-frames in the 19/66's don't bother, they're 'hen's teeth' a 3'' barrel is desirable for the shortest
barrel with a full length ejector rod. S&W doesn't even list the 3'' barrels [they were for selected MIL/LE. units] & don't 'Officially exist'. They
made an L-frame mod. 686/CS-1, which were produced in extremely small quantities, they were supposed to be issued to 'undercover Customs agents' a small number actually made it into the field, before 'then-Attorney General Janet Reno ruled to have them destroyed] for whatever reason! The most desirable are the older Smiths' with; the hammer-mounted firing pins, the pinned barrels, and the 3 screw frame plates, also countersunk cylinders for the rimmed cartridges. The older Smiths' had better QC and it seems better ordinance steel, they don't seem to have
the problems of 'the newer, higher number production runs.
In the early days of 'Richard Marcinko's first RED-CELL shooters, as well as with most of the first-generation 'Anti-Terrorist shooters' a 3''/.357 revolver was the sidearm of choice. This, before the era of the 'Plastic Black Guns' even the Euro-warriors asked to carry them [which created Nationalistic-Pride issues for the Special Units in their countries]. I was a first-generation 'Anti Terrorist shooter, now they're call 'CT/Counter Terror warriors'. 'Back in the day' we asked for/and carried 3''/.357/med.-frame revolvers. We were 'well equipped' to handle anything w/6-.357 HP's, we learned to really shoot, instead of relying on 'hi-capacity mags' and we used 'speed loaders & speed strips' for combat reloads, ''when
you have 6 in a wheel, you made sure you hit whatever you were aiming at.''