Seating dye

The seating stem is a poor fit for that particular bullet. You can get another stem that fits that particular bullet better, or you can chuck up your stem and grind it out to fit.
 
can you feel it with your fingernail? If not and it’s just cosmetic then it’s no problem.

Put a bullet in the drill and a little lapping compound in the seating stem pushed together will polish them together real quick.
Edit: damn new phone autocorrect
 
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here's a nice description that demonstrates Spife7980's technique