I have a Sig P-226 9mm that's accurate enough to make me very happy. I CCW it inside front pocket of trousers, but need to wear a long pullover to hide the grip, which sticks out just enough to show. I got it cheap as a LE trade-in. If I ever have an emergency and need a gun in semi-auto persuasion, this is the only one I own that I trust 100%.
Most accurate .357 Mag has been an old S&W Highway patrolman, Model-28 6" and a Colt Trooper MkIII also in 6" length. Believe it or not another keeper is my 2 1/2" S&W 686+. My main CCW gun, it has the dreaded lock, but the trigger is slick as snot and it puts 'em where the front sight says they're gonna go.
Now if I can find an accurate S&W pawn shop wonder in 4" barrel blue, fixed sights, I'll be a happy man.