Does anybody have any experience with Gaugemate shotgun chamber inserts?
http://www.gaugemate.com/
You put one in your 12g breakopen or pump shotgun and it allows you to fire a smaller round. Not only 20g, 28g, and .410, but also pistol rounds like .45 ACP, 9mm, and .22lr.
Clever or stupid? I guess the answer lies in whether you can actually hit anything with the pistol rounds.
Gaugemate: Incredibly clever or incredibly stupid?
1"To initiate a war of aggression...is the supreme international crime" - Nuremberg prosecutor Robert Jackson, 1946