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Major runout with 280AI my thoughts?

Hi guys I have a tried 3 280ai comp seaters 2 reddings and a forster reamed out.
So my problem is no matter what die I use to seat the bergers 168gr on Nosler brass I get 005-010" runout. My brass is sized and only has 001-002" runout max, it is annealed every 2nd firing. Its sized with Lee collet die and or redding full length die.
Now I do not believe its my presses forster coax and supreme rockchucker,I'm pretty sure dont have donuts causing that amount of runout.
It happens only with my 280AI seater with nosler brass, I use same setups with my 7mm Dakota, and my 7rem mag and the most I get is 003"runout.
So Are the necks of the nosler brass bending somewhat during the seating process? As that seems to be the only thing that makes sense to me .
Anybody ever run into this particular problem??

Thx
Elmer
 

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