Curiously, i had the same suspicions about my Mossberg Shotgun so I put this same point to Wilson's Hunting and Outdoors in Wanganui yesterday and their view is it is the higher size. 3 inchIf you think about it, it's OK to get five cartridges in and it is what's stamped into the barrel, so if you can get 5 x three inch in you're OK
And of course remembering that three inch cartridges are actually 2 1/2 until fired........![]()
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