In his book, Fast and Fancy Revolver Shooting, the legendary Ed McGivern felt strongly enough that people have enough inherent ability that he felt he ought to (...no kidding here...page 460...check it out) detail the right and wrong way to hold a silver dollar-sized target in your fingers or on your head.
For the rest of us, though, to get an idea of how good is good, and how good is Hollywood, it'd be worthwhile to look at bullseye shooters. The 25 yard slow fire 10-ring is 1.51" in diameter, and given that Master class bullseye shooters score 95% or better, it stands to reason that it would take a Master to consistently shoot approximately 2" 25 yard groups with a highly-tuned .45. That's twice the size of a quarter, so the same Master could hit a quarter consistently at 12.5 yards during slow fire. Hitting that same quarter on demand at any distance quickly or while point shooting or moving or with an old cowboy gun would be an extraordinary feat, indeed. That being said, Tom Knapp shot a .22LR through a washer thrown in the air, so extraordinary feats are possible.
