Gunsmithing Proof barrel bored off center

No big deal. It doesn't have to be perfect to be accurate and repeatable. It just has to do the exact same thing (barrel whip\harmonics) every time.

So long as the muzzle threads are concentric to the bore I'd run it till it's dead.
 
I’ve heard some hit or miss stuff with Proof. Kind of sucks I want to build a long range hunting one eventually

Build with confidence, they're good to go. I've had 7 Proof carbon barrels and they all shoot amazing. Pretty much every rifle I have built will wear a Proof on it.
 
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