270 gevelot brass

That's interesting that scuffs are different lengths. Is the seating plug dragging or galled? What kind of dies? Did you try another brand of brass?
Maybe the necks are very thick brass? Do you have a caliper to check the outside diameter and neck wall thickness?

Took apart the seater and it looks fine. Wiped it down.
OD of the brass after loaded is .303. SAAMI show .308 so that should be ok?

Maybe its just the brass?
 
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