Full choke on a 410 is the same as the shell.... .410 inches. If the .410 were measured traditionally, it would be 67½ gauge. A round lead ball that fits the barrell would be .671 grams. Most 410's have a full choke because of the light shot load which needs to be concentrated for effect. This requires more accurate aiming than the wider patterns of the heavier gauges. But it is favored as a training/first shotgun because of the reduced recoil.
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