Got to admit, 22 tumbling seems rare. Still, as with any trouble shooting attempt, you'll need to change one variable to get more data. Suggest you clean the gun, then go out with a few other brands, bullet styles and see if they do the same. It could be unique to that ammo (or not).
p.s. While your cleaning, I would check timing and barrel interior/ crown.
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Dave
Last edited by Wee Hooker; 07-12-2017 at 04:21 PM.
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