I've been using Cheddites for 2 or 3 years. At one time I was loading 30 to 40 boxes a week for myself, wife, daughter, and granddaughter using Cheddites. The only time I noticed a pierced primer is with my Parker hammer gun, and only the right barrel. The two Lifters never did it, three Remington hammer guns don't, two Parker hammerless don't, and three Remington hammerless don't. None of the modern shotguns the wife or daughters don't. For this reason I'm lead to believe it's more of a firing pin problem. I suppose you could get a double charge if something was blocking the the drop tube. I had a primer stuck in a Mec drop tube. Must have been a loose one in a empty shell. Wonder why your shell base was bigger than others? I would think that's a sign of too much pressure.
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Paul Harm
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