I'm having the exact same issue with the exact same shells! When you shoot, the 2nd shell gets caught in the open action? The extractor pin gets caught under the shell, instead of on the lip of the shell?
It was killing me this weekend. It's a nice patterning shell and has good killing power. First group of ringers comes in and I absolutely crushed the first one, go to pull on the 2nd...nothing. Same exact thing happened on a flock of gadwall. Really chapped my ***. And I'm shooting a Remington 1187 super mag (which I just cleaned before I left for the weekend hunt).
I've put 2 boxes of Kent 3" #3's through it this season with nary a problem. I'm no expert, but I think the hypersonics might have too much juice.
I'm bringing the 2nd box I bought back to Cabela's and loading up on the Kents.
I was having this problem this weekend with the same gun (1187 Super Mag) the second shell in was getting caught, but I was shooting Estate's,not sure what the problem is,,,,,