I would be very suspicious of the Winchester economy shells. The plastic is very prone to splitting. Last summer my son had some and in one box two shells were split clear to the top of the steel head. Perhaps further but we did not dissect them. One was so bad it would not chamber. These were factory loaded shells. I would not be surprised if there was much more than primer gas at play here.
Once I tried to reload some because the hulls are so easy to acquire. I quickly quit as many split longitudinally when inserting the wad. Those hulls/shells are terrible.
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