My 1937 vintage 28-gauge Model 12 Skeet Gun doesn't seem to like modern 28-gauge shells. It seems their rims are just a bit thicker than vintage shells. Last time I shot it, it worked "slicker than the hired girl's leg" with a box of vintage Winchester paper Super-Speed 28-gauge skeet loads. Like these, but with #9 shot --



Eightbore can probably figure out where the box of shells I used came from.