Bhemry: Sadly a page has somehow escaped my handloading log book binder - and that page is one I made for my Smith & Wesson Model 647 (six shot stainless revolver in 17 HMR with 8 3/8" barrel).
I can't imagine where it went.
Anyway I have a straight 10 power Burris pistol scope on it.
It is similar to your Model 617.
It shoots extremely well - with an outstanding single action trigger pull.
I have Hunted with it a lot and killed all manner of small game and Varmints with it - along with some Grouse.
If I recall correctly it made 6 shot groups at 50 yards just under 1.75" inches - this off of sandbags and at times with sandbags "holding" the pistol down/steady.
I think if I owned your Model 617 (and someday I hope to own one!) I would be somewhat satisfied with 1.25" six shot groups at 25 yards.
I always want my firearms to be more accurate but in the real world that does not always happen.
I will keep looking for my misplaced page to relay my exact results with my 17 HMR Smith & Wesson.
Hold into the wind
VarmintGuy