It all depends on the diameter of your barrel. Some barrel are smaller at the thread zone than others. Typically on a factory barrel , the taper starts right at the breech and is a straight taper to the muzzle. With 1.055" or slightly less at the breech end, it usually ends up about 1.035" at the end of the threads, A half inch past that couold be 1.025" or smaller depending how much was polished off.
If the chamber is too far off center, it may not even clean up in a half an inch.
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