The one I shot (in '88, IIRC) was not so accurate. Less accurate than the G17s then available, less accurate than the S&Ws then available.
It's been a long time, but I recall benched 25-yd groups in the 4-5" range. I don't think we fired any ammo except 115-gr (all that was commonly available in '88), both FMJs and JHPs. My friend who owned the P85 (the gun store I managed had raffled it off in a drawing, and he won) qualified with it for Albuquerque Police Department, but the range guy was not impressed with it and suggested he move on to something else.
Not long afterward, my friend did . . . a S&W 25 in .45 Colt.
Personally, I would avoid the P85s and head for a newer Ruger model (if one is determined to buy Ruger).
I'd just caution you again on the P85. Remember, this is the pistol that Ruger felt the need to remodel (into the P89) almost immediately after it hit the market (and don't let the "85" fool you - these didn't hit the streets until '88, and they weren't easy to find until '89).
dante, You have the right reason for keeping the P85. I have never owned or shot a P85; I have a P95 that I am happy with. But for my money the best accuracy for an out of the box Ruger is the KP90, 45ACP. It will out shoot any of my 9mm pistols and I can out shoot my buddy with any of his 1911's. poppy