If You're Performing Reloading Drills with Your Scattergun, You'll Need These...
Specifically, 'dummy rounds'. Having them get's rid of a LOT of anxiety for others watching, especially if you're indoors. This is just one brand; there are dozens out there. For me, 10 dummy rounds is enough for good practice.
You probably practice reloading with your pistols and rifles, and so should you with your scattergun.
All safety rules apply. NEVER get apathetic, even with dummy rounds.