I have found a lot of difference in 9mm cases.

by JimT, Texas, Sunday, June 23, 2024, 14:15 (25 days ago) @ Gunner

Thicker or thinner case walls ... tight primer pockets ... once-fired brass sometimes contains military brass with crimped primer pockets ...

That may not be your problem as I don't load anything on progressives, having gotten rid of mine years ago. But even on single stage presses I have found the 9mm to be challenge at times.

Ele era velho.
Ele era corajoso.
Ele era feio.

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