I don't Imagine It is what gun they ended up shot it, that usually displays as a base bulge after sizing. I would probably evaluate you sizing die and powder funnel. My the latest order for a Lee 9mm carbide "undersize" resizing die that decreases the case diameter by .003" https://josuexsnkm.idblogmaker.com/36992838/the-single-best-strategy-to-use-for-9mm-bullets-for-reloading