just for clarification, I was looking at a ruger blackhawk 45 colt, 4 5/8 barrel, and bought a blackhawk 357 mag 6 1/2 barrel.
As you can see from the posts, there is a lot of differing opinion on the subject.
I think you made the best choice. If I were in your shoes, I would have opted to for the longer barrel as it has a better sight radius and will be much more accurate.
Since it is a Ruger, you can really put the "magnum" back in 357 magnum. Most factory 357 Magnum ammo has been downrated since when the cartridge first came out. Look around and consider some specialty ammo that provides real magnum performance. I also recommend "heavy" bullets of at least 170 grains, not the ultra-light 125 super fast bullets.
Check out the Buffalo Bore website and their product line...
http://www.buffalobore.com/ammunition/default.htm#357If you handload, read up on Elmer Keith's thoughts on the 357 Magnum.
I really like the Hornady 180 grain XTP bullets and a lot of Alliant 2400 powder.
Another thing for you to consider is how do you like the single action grip. Some folks have a real hard time with the traditional single action grip. It is smooth and suppose to allow the revolver to ride up under recoil in the hand. Some folks have a hard time consistently gripping it and don't get the accuracy they need. If that is your problem it should become apparent real quick at the range when you practice. If so there are target grips, which are much more like a double action grip in shape that help you better control where it is pointing, but don't help as much with recoil absorbtion.
CDNN has some inexpensive checkered grips that are an inexpensive alternative if you are not use to the standard Ruger Blackhawk single action grip. They can be had for just a few dollars, but whatch out for the minimum charge.
http://www.cdnninvestments.com/woodblacchec.htmlI would also suggest, especially with a 6 1/2 inch barrel that you spring for a good holster. I would actually suggest a shoulder holster. Of my three Blackhawks, I have installed on one of them a red-dot sight. I actually prefer the open metal sights most of the time.
Good luck and enjoy your magnum!