Lapua 338 LM, neck sizing, donut removing

Mush

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I'm using Redding comp die set for 338 LM
I'm bushing neck sizing.

As I understand, the necks will develop soon a donut outside and maybe one inside too (not so sure of that last one).

What is best treatement ? Outside neck turning but what about the inside ?

After how many firing does the donuts will appear ?

Thanks
 
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