Only adjustable choke I have is on my old bolt action Mossberg Model 183KE .410 and it's cranked down to F. I see no damage and it shoots slugs as good at Full as it did any other setting. But that's only one gun, your mileage may differ.
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Good intentions will always be pleaded for any assumption of power. The Constitution was made to guard the people against the dangers of good intentions. There are men in all ages who mean to govern will, but they mean to govern. They promise to be good masters, but they mean to be masters.
--Daniel Webster--
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