If you're keeping the existing bolt, anything in the .223 family including 204 Ruger, 17 Remington, .300 blackout, .222, .222 Rem Mag, .221 fireball, .17 Fireball....just to name a few.
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.300 blackout is a .30 caliber.
Bore diameter isn't the issue, it's the size of the case-head.
Say you wanted to chamber in a .308-based case, you'll need a new bolt which will cost about $200+ your smithing fees and the price of the new barrel.
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I figured since you can run .300 blackout and 6.5 Grendel on a regular AR BCG it would work with a .223 bolt face.
Honestly if that's the case I would just fix that gun up to sell and sell it. Then get a .308 bolt face action.
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Are you reloading? If so, how 'bout a new barrel in .223AI?
Either run the 223 gun. Or sell it and buy another.
PB
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