The reality is that if you want to get really fast reloading your shotgun then you need to practice. Practice, practice, practice.
Watching TV with your wife? Practice reloading your shotgun with dummy rounds while you sit there on the couch.
Sitting in front of your computer waiting on it to finish performing its new update? Practice reloading your shotgun with dummy rounds while you wait.
You have to practice so much that reloading your shotgun just becomes automatic and natural.
As you know, in a 3 gun competition, you are always going to be a lot more shaky than you would normally be because your adrenaline is flowing. There is nothing you can do about that besides simply entering more 3 gun competitions or engaging in some other form of practicing shooting under duress.
What you can do though is automate your shooting and reloading habits. When it comes to the shotgun, shooting fast and accurate it fairly easy. Its the reloading that's hard. And the good news is that you don't even have to go to the range to practice. You can practice at home any time with dummy rounds and it won't cost you a range fee or ammunition expenses.
Find a 3 Gun Competition in your area and get started in 3 Gun today.