I don't think It is really what gun they were shot it, that typically reveals as a base bulge soon after sizing. I might almost certainly evaluate you sizing die and powder funnel. My latest order for a Lee 9mm carbide "undersize" resizing die that minimizes the case diameter by https://9mm-case74062.blogdun.com/37009512/how-much-you-need-to-expect-you-ll-pay-for-a-good-9mm-once-fired-brass