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Common Choke Constrictions
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| .000 restriction - cylinder |
| .005 restriction - skeet |
| .010 restriction - improved cylinder |
| .015 restriction - light modified |
| .020 restriction - modified |
| .025 restriction - improved modified |
| .030 restriction - light full |
| .035 restriction - full |
| .040 restriction - extra full |
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Shotgun
bore diameters
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| 10
gauge = .775 |
| 12
gauge = .729 |
| 16
gauge = .662 |
| 20
gauge = .615 |
| 28
gauge = .550 |
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