I have used them in a Mossberg 500 without problems, and te darndest thing is that I can squeeze 11+1 into the gun and it functions totally flawlessly. And were talking about shotguns in HD situations, since statistically they are fired from inside 20 feet, who cares about pattern. They are lose, with multiple flyers noted on the pattern board. I cured this by swithching from the IMP. CYL. choke I used with 2 3/4" to a modified choke and I get approximately the same pattern! Neat concept, kinda expensive but if a confrontation lasted long enough it would be nice to have 11 instead of 6!
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DOCSpanky HM3 USN
Happiness is a smoking gun and a dead criminal