I want to thank you all for an input! Some great recommendations. I would feel shy of asking someone to shoot their gun on the range, but by reading some posts here, I assume it's more or less a common practice. I will try that.
I also found a range not terribly far that has Ruger GP100 4" and SP101 as well as S&W 60 3", 686 4", and 686 6". Not a huge variety. But at least it's more than a choice of 686 in 6 or 7 shots the range I usually go to has...
Thanks again. Any other recommendations are welcome as I am somewhat of a newbie. I got some gun training 20-some years ago in Russia, so I am a decent range shooter (for an amateur), but most of my experience with revolvers is purely theoretical :-)))