I have an H&R single shot .410 that I had drilled and tapped and put a red dot on it years ago. I've had no luck selling it so I'm thinking about cutting the barrel to remove the full choke. Messing with a removable choked .410 bolt gun we found the tightest groups and highest velocity with no choke (external threads). How far back should I cut it to remove the choke? Any tips for keeping it square? Should make a dandy short range deer/varmint shotgun....
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