The most accurate handgun I've ever fired was my buddy's S+W 29 Classic. I'm sure if I picked up a Contender that wouldn't be the case anymore. I've only seen one being fired, I haven't touched one myself.
Ya know, I didn't think I liked Contenders for a long time, but I sorta got a hankerin' for one, drove to Houston one day and found a used one with an old octagon .45 Colt/.410 barrel for about $250 at a well known gun shop on west Fondren. I played with that, but later got a .30-30 barrel and scoped it, then a .22 barrel and scoped it, then the 7mm TCU. I tell ya, I've converted completely to a TC lover. It's the rifle accuracy of the things and I'm a handgun hunter, so it's a one shot, one kill attitude. I did take two deer a few years back with it, though. Fired and hit the buck, grabbed a cartridge off my wrist carrier and reloaded, and took the doe when she was trying to figure out what happened. LOL This was at 90 yards shooting from a tripod stand with a gun rest on it. I'd get an Encore, but I really don't need more than the .30-30. It's still packin' 1000 ft lbs at 200 yards and dead on with a 150 Nosler Ballistic Tip. It's sighted for 200 yards and is only 3" high at 100, flatter shooting than any magnum handgun caliber I know of.
I was at an informal club shoot once and they were shooting .22s and I didn't have anything to shoot. Friend sho shoots bullseye a lot loaned me his M41. They allowed me a few practice shots to get used to it. My God, first shot went off soon as I got my finger on the trigger. LOL. He had that thing set down in the ounces which I'm not used to. I got the hang of it and finished second to him in the shoot. LOL. That iis a lot more accurate gun that I am accurate, I can tell ya that, but then I own a few guns that are more accurate than I am.
I've also shot his M52, another awesome accurate bullseye gun. But, neither of those guns can group 3" all day long at 200 yards. My contender can.
With a little more scope power and a cross hair rather than the 4 mil taper dot reticule, I think I could get a 2" group out of it at 200, but, who's gripin'? LOL It's plenty good enough for deer hunting.
As service guns go, my Ruger P90 is pretty accurate. My Taurus M66 will put 6 shots into an inch at 25, too, as will my Blackhawk in .357 and my .45 colt blackhawk. They are slightly more accurate than my Smith M10 OR my M19. The Blackhawk is a 4MOA gun at 100 yards with magnums. These handguns are right out of the box, nothing special. I haven't owned too many autos, though, and the P90 surprised me with its accuracy for a bone stock affordable pistol. It's more accurate than it needs to be. My Mk2 will shoot 1" with about any cheap ammo at 50 yards, but I cheat and have a scope on it.