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Hard extraction on bolt gun

Pic 1 is new and shot once lapua brass
Pic 2 is bore scope where the lands touch the chamber
Pic3 is the chamber
Looks a little scratched up
It may just be the pic, but it looks like you have some bulging at the base of the shoulder. That's very bad, is the result of a poorly cut chamber and would cause this exact problem.
 
I wouldn't try to polish that out myself. I would have it done by a smith. Also might try resizing a piece of new brass but I'm not sure it would help.

Who was the smith ? Hate to hear that he passed.
 
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