upnorth,
Take a look at Sturm Ruger's website. They have a catalogue that will show you pictures of their handguns. You can compare the shape of the Bisley to your grip. You can also compare their product code to the one on the end of the box that yours came in.
As far as effective range goes, I would think that whatever distance you could, consistantly, place your shots into a 6" circle would be your effective range.
Best,
TnNuc