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Any barrel will shoot better fouled. Even my centerfires are only cleaned when accuracy drops off. It takes 10-12 rounds through them before accuracy returns to normal. It takes 200 or so before it starts to degrade to the point where they need to be cleaned.
I cannot remember the last time I cleaned a 22 barrel other than to wipe out water after being caught out in rain. The action, ejector, etc., and all other parts are cleaned often to ensure reilable functioning.
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