12.7 barrel chamber question

[41bear]

I had scratches on my brass also. In my GB Faxon 12.7 my fired brass is measuring 1.214. I am resizing to 1.212, about 2 thousands difference. It seems to be working for me.
I would be curious to know what your fired brass is measuring.

I believe factory ammo will always push the headspace back on their ammo just to make sure they chamber.

Am going to visit my daughter next month and there's a 400 yd range there so hopefully I'll have a report full of info on my 12.7", 16" (2 - a Faxon and a X-Caliber), and the 18" when I get home.