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converting to rifled to smooth

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  1. Y

    Converting old Thompson barrels to smoothbore? Shotgun sizes?

    Hi... I have a couple of old shot out Thompson Center barrels. I am wondering if anyone has ever reamed them out to turn them into shotguns? Or smoothbore? One of said barrels is 15/16 across the flats and the other is 1". What would be the safe bore size for each barrel. The 15/16 is...
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