My most accurate Revolver is also one of the oldest and most shot guns I own. It's a 4" (pre M15) Combat Masterpiece that belonged to my Dad and (I'm guessing of course) probably has more than 50,000 rounds though it! It will shoot 1-hole, 3/4" groups at 50 feet all day long! The Target hammer is so worn, that the checkering has been smoothed over. The gun is on it's 2nd barrel, the internals have been replaced at least 2 times that I know of, as have all the screws. The cylinder and standard Walnut Magnagrips are original. The single action trigger pull is 2 pounds and smooth as silk!
I own PLENTY of newer .38's and .357's in all barrel lengths and none of them can shoot this well. The others are very accurate, but this particular gun just seems to be an extension of my arm, and continues to amaze me.
Chief38