I've shot Winchester silver box #5s out of my 28s- they dont like 5s!
I shoot 7¹/²s for pheasant, chukar and Huns from my 41, 28 and 20 ga.
I'd pattern those factory loads at 10 yards just to see what they are doing. Then I would contact the manufacturer customer service and state your problem. Could be some issue they aren't aware of.
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