| 10 | 12 | 16 | 20 | 28 | .410* | |
|---|---|---|---|---|---|---|
| Bore Diameter Inches | .775" | .729" | .662" | .615" | .550" | .410" |
| Bore Diameter mm | 19.685 | 18.516 | 16.814 | 15.621 | 13.970 | 10.414 |
| Relative size |  |
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* .410 is not a gauge! It is the actual bore measurement in inches. All other gauge sizes are based upon the number of pure lead spheres of a specific size it would require to have a combined weight of one pound. (ie... it would take 20 balls of .615" in diameter to make one pound. Therefore a 20 gauge.) |
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