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Gunsmithing 6 Dasher freebore and neck?

Yep, .274 or .275 neck is best. If you end up with something with a .014 neck, you still have plenty of clearance.

I’d do .104 FB. As you can always have it throated for more.
 
I have a .272 neck .104 freebore reamer that has been awesome using alpha or Lapua unturned brass.

It no worky with Peterson. Get at least a .274 for Peterson.
 
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