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Common Choke Constrictions
.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




Shotgun bore diameters
10 gauge = .775
12 gauge = .729
16 gauge = .662
20 gauge = .615
28 gauge = .550