It's not uncommon for the seating stem to leave a ring around the bullet. Especially if there is a lot of neck tension present. You mentioned expander ball problems. Could it be that your expander is not expanding the necks enough? If the force needed to seat the bullets does not seem to be more than with your other dies, then take a bullet and some lapping compound and lap the seater stem to remove sharp edges and/or burrs.
Thanks for the input guys ill do just that seems like thats all it needs. Although i dont like how much my F/L die is working the necks compared to my 300wm neck sized only cases that i used a lee collet neck sizer die on. These sized only about .002 smaller than bullet diameter and were much much easier to seat bullets into. I observed no bullet ringing with my 300wm cases that were only neck sized as well.
I've never seen a bullet get that marked up from seating.
Agreed. Seems to me that seating stem is putting a great deal more pressure on the bullet than 'normal'.
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