Thanks snuffy & rg1.
Not all of the affected loads were trimmed, must not have chamfered enough.
I loaded another 100, chamfered all, and brushed each mouth, seated much better no marks.
Quote:
Some polish the sharp radius of their bullet seating plug to reduce the chance of marking bullets
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I thought about this, but this is the only bullet / brass combo that I have ever had an issue with. I would probably mess the seating cone up and make things worse.