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Shotgun bore diameters
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Although shotgun bore diameters and Choke
dimensions very from one manufacturer to
another, the
Small
Arms & Ammunition Manufacturers Institute
(SAAMI) has issued
recommendations for standards. Below are
the recommended dimension for each gauge.
All dimensions are for internal diameters.
|
Gauge
|
Bore
(inch)
|
Full Choke
(inch)
|
Modified Choke
(inch)
|
Imp-Cyl Choke
(inch)
|
|
12
|
.729
|
.694
|
.710
|
.720
|
|
16
|
.667
|
.639
|
.652
|
.660
|
|
20
|
.617
|
.592
|
.603
|
.610
|
|
28
|
.550
|
.528
|
.538
|
.545
|
|
.410
|
.410
|
.393
|
.402
|
.406
|
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Cylinder choke would of
course be exactly the same as the bore
diameter per gauge.
This chart covers each of the
chokes in the amount of constriction
|
Gauge
|
Bore
(inch)
|
Full Choke
(inch)
|
Modified Choke
(inch)
|
Imp-Cyl Choke
(inch)
|
|
12
|
.729
|
.035
|
.019
|
.009
|
|
16
|
.667
|
.028
|
.015
|
.007
|
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20
|
.617
|
.025
|
.014
|
.007
|
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28
|
.550
|
.022
|
.012
|
.005
|
|
.410
|
.410
|
.017
|
.008
|
.004
|
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Cylinder choke has no
constriction and is the same as the bore in
diameter. |
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