Although many seem to favor the S&W K-frames over the Colt Officer's Models, I've owned several of the latter and really thought they were the nicest double action revolvers I ever owned. For target shooting, the best of the lot is probably the Officers Model Match, which has the fully adjustable micro-style sights. It's not necessarily better fit or finished than the Officers Model Target or Officers Model Special (a very short term variation with an odd rear sight dovetailed into the rear of the frame), but the sights are a far better design. The early ones (the first OMM was produced in 1953 if I recall correctly) are extremely well finished. The last ones (1968) weren't quite as well polished. In any case, they are full sized, hand filling revolvers that are more accurate than most people can shoot, even off a rest.
The Officers Models all have the same action design as the Python, which is the Colt double action revolver of legend. The Troopers, which are not quite as well finished, but are quite nicely finished inside, do as well, but not the Trooper III or Trooper V, both of which have coil springs, as I remember.
I have owned 4 inch Troopers in both .22 and .357 and do regret selling them to finance some shotgun purchase of one kind or another. The best single action trigger pull I ever found on a Colt double action revolver was on that Trooper 4 inch .357. It gave me a complete understanding of what a trigger that "broke like a glass rod" really meant.
As an aside, if you stumble across an Officers Model Match in .22 Magnum, buy it. They are quite rare (maybe 1200 manufactured over the life of the model).
