I have had both, and the 586 was one revolver that I personally could not hit the broad side of a barn with if i was standing inside it. My friend who is goofy-foot (or southpaw if you prefer) could punch the eyeballs out of a flea with it at any distance up to around 50M. His groups would open up a little the further down range he went.
I could shoot my Python with great accuracy and confidence, right alongside. I once hit 5 out of 6 4" clay birds on a berm at 96 paces with it. I routinely ring the gong at 65 yds with my son's .45. ( but not with mine?....go figure.)
I traded the 586.
I reckoned the revolver was one that would not go on target well, but it did group fairly well.
In November, I had opportunity to re-acquire a 586 that the seller had shot a few times, with excellent results.
What I can do with it still remains to be seen, but I am optimistic.
I am hot to get some good performance out of it.
The Python was and is the easiest handling, best shooting, most accurate .357 in my pile.
These are them.