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Your problem is incorrect wad column length. You have more stuff in there than the shell can hold.
You'll have to reduce 1. Powder charge. 2 Shot charge and/or 3. Wad length
Or a combination of all three.
In my 12 I use a claybuster yellow wad, 1 oz of shot and about 35 grs of FFg.
Makes for a nice load with light recoil and enough pop to take down any knockdown.
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