SnWnMe:
"Well, the 619 and 620 also have the same dimensions as the 686 so they are not just 7 shot 65s and 66s. They are L frames."
It fits with what I caught from rumor central, that S&W was completely phasing out the K Frames, in favor of L Frames. So, you will have the older L Frames with the full lug barrels, and the newer "pseudo K Frame" L Frames with the half lug barrels. Why the difference, other than some people just like the look of the half lug better than the full lug, and they shaved 1 whole ounce off the 686P? Whoopee Doo. Now what I'm wondering is that with a relative concentration of models in the L Frame line, are they going to pare some of those down, too? I mean, why have both the 620 and the 686P? There isn't enough difference between them to rate having 2 different models, IMHO.
Speaking of the rumors of S&W dropping the K Frame line, what about those old classic .38 spl models? Are they going by the wayside? It wouldn't surprise me, but it would sadden me.
Oh, BTW, S&W actually does have to compete with Taurus. Apparently there actually are people who like having an extra shot or 2 in their revolvers, Taurus is giving it to them, and some people are buying them for that reason. S&W has to provide that as well, or face loosing market share. Personally, I think that S&W is slipping a little overall, and Taurus is picking up some overall, too. Hence, the gap between them is closing.