Periodically it's a good idea to check to see if you have developed any bad habits.
At a Steel Challenge match, I discovered that I was consistently shooting under targets. I went to the range for a practice session and found that I was shooting low on the Cowboy sized targets. Over to paper!
Yup, I developed a bad habit. I started pushing the gun down a little as I was squeezing the trigger. I think this was done to help with recoil when I was shooting 45's while my 38's were in the shop. I would never have discovered that without shooting small dots on paper. It's taking a long time to fix this so I think I must have been doing it for quite a while.
Shoot dots once in a while to see if you've developed any bad habits. You might have to video tape yourself to check.
It's worth doing once every month or 2.
Doc