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Old October 17th, 2020, 09:32 AM #2
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Doco Overboard Doco Overboard is online now
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Join Date: Jul 2016
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Posts: 4,098
Sometimes if you remove the choke tube before cleaning the barrel what will happen is the fouling from barrel cleaning can wind up in the internal threads. It's surprising how gritty the thread surfaces can become from what was thought to be a clean barrel if they were allowed to be pushed through. By accidentally doing so this can allow can allow tight threads when you re-assemble.
I would remove the choke tube, and carefully clean again the the internal threads of the barrel and the threads of the choke tube as well.

Something else you can to do to help determine if the replacement choke may have a thread problem is carefully inspect for threads to make sure they are straight to the choke itself, the same outside diameter or slightly less than the original one (measure with some calipers at more than one location) or do not have plastic wad residual or dings at the muzzle or internal side of the tube.

The other thing is if the new choke became slightly loose while shooting and then cleaning was done afterwards, when the tube was re-installed it could have pushed some fouling in ahead of the threads when it was re inserted.
Carefully cleaning just the barrel again should help to clear it up.
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