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NATO chamber specs are longer than commercial 308 Win specs. not a huge difference, but a chamber on the long side of NATO spec can be unsafe to shoot comnmercial ammo in.

short-chambered refers to a new barrel that has not been fully chambered, it was left short intentionally. before or after the barrel is installed, the barrel is reamed for the headspace for that particular receiver bolt combination.

there are no chrome-lined short chambered barrels 'cause you can't just finish ream chrome chambers
 
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