I have a 629-2 that isn't labelled as a Classic or a DX. It shoots great out to 175 yards. That's the distance I could shoot a center mass size group with the only rest a post I was leaning the gun against. Actually it was a gallon jug I was shooting. It's plenty good enough for bear defense duty which is why I carry it sometimes in certain areas. My farm is over run with bears these days. Heck they're all around my house too. But they aren't aggressive or haven't been so far. I carry it "just in case". You never know.

I always understood the DX to be a model picked because of it's accuracy. I've also heard it said that the testing was quick and simple and wasn't really a good indication of which guns would ultimately shoot better. I got that info from this board several years ago right after I bought that handgun.