A number of things can cause pierced primers. Among them are thin primer caps (or a substandard production run), misshapen firing pin tips, excessive protrusion, etc.
You don't specify the gun you're using. I assume a Parker. Still, I'd simply make a switch in brands and see if the issue goes away. Personally, I prefer Federal 209A. In addition, I would discourage you from the Fiochhi brand. Imports tend to have thinner caps. Especially the vile Cheddite primers.
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