Lead ? or wax with shavings mixed in?
I have found that when I reload my cast bullets that are "liberally" coated with lube, I get a waxy plug up on the seater of the seat die.
When I notice that bullet set is getting deeper I stop pull the die ad clean out the waxy s----.
If it is all lead you are shaving off some lead while seating and you need to flare the case mouth a bit more.
Gary
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