I've tried that technique and don't care for it. With a snub nose you burn the snot outta your index finger and with semi-autos the slide is liable to slice your finger. After trying that technique I realized why they call that finger (#2 on the hand, just to the right or left of the thumb, hand dependent) either the trigger finger or the index finger and these two anatomical indicators are the result of man's development of firearms.
Hey, we didn't call it anything until we got a trigger for it to pull, so then we called it a 'trigger finger'. When we found out that continued manipulation of a trigger by a trigger finger actually causes the cylinder to 'index' to the next round, we called it the index finger.
Now, when I was a kid, we used to set up dried out cowpie on edge and shoot at them till they busted up and we used to refer to our 22s at the time as 'pooper shooters' but now that term refers to another of our anatomical body parts, so once again we have man's development of firearms and related fun to thank for medical terminology................................................ why do I feel like this is the 'Cheers' episode where the Mailman explains his theory of evolution and alcohol.............