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Choke Tube Diameter and Constriction Table

January 10, 2020

Knowing the diameter of a choke tube is important in order to identify choke tube constriction. The tighter the choke tube, the more constriction and the less constriction, the more open a choke will be.

Choke sizes are classified by both their measurement (to a thousandth of an inch) and by a special naming system. Choke measurements range from open chokes of around 0.735 to 0.770, to more restrictive chokes of around 0.600 to .0680. Choke tubes are also classified by a naming structure that includes (from open to tight) cylinder, skeet, improved skeet, improved cylinder, light modified, modified, improved modified, light full, full, extra full, and turkey.

Choke Tube Constriction Chart

The choke tube table above shows the diameters and constrictions you can expect for choke tubes and shotgun barrels of a specific make and type, as well as for 12-gauge, 10-gauge, 20-gauge, 16-gauge, 28-gauge, and .410 shotguns. Most popular choke systems are shown which include, Browning Invector, Invector Plus, Remington, Winchester Invector, Benelli, and Beretta.

Choke Tube Markings

Markings on choke tubes come in a wide range of variations, but their meaning across the spectrum is largely the same. Manufacturers can use a notching/serration system, color coded, alpha naming scheme, and color banding to indicate the dimeter of the choke tube. This is done for quick verification without having to remove the choke from the gun in most cases.

Browning Choke Tube Markings

I – Full Lead or steel

II – Modified lead, Improved Modified Steel

III – Improved Cylinder lead, Improved Cylinder Steel

IIII – Skeet lead, Modified Steel

None – Cylinder lead, Improved Cylinder Steel

Benelli Choke Tube Markings

I – Full

II – Improved Modified

III – Modified

IIII – Improved Cylinder

V – Cylinder

Beretta Choke Tube Markings

I – Full

II – Improved Modified

III – Modified

IIII – Improved Cylinder

V – Cylinder


Choke tube diameter is measured from the inside walls of the choke and recorded to a thousandth of an inch. This measurement determines the choke tube size. Choke tube markings are an easy way to visually confirm choke tube diameter without having to measure.

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1 Becker's Exclusive Kits - SF12601K School Supplies Choke Tube Set, (Set of 3) Becker's Exclusive Kits - SF12601K School Supplies Choke Tube Set, (Set of 3) $16.83 Buy on Amazon
2 Carlson's Choke Tube Beretta Benelli Mobil Cremator Non-Ported Waterfowl Choke Tubes, 12 Gauge, MR & LR, Black Carlson's Choke Tube Beretta Benelli Mobil Cremator Non-Ported Waterfowl Choke Tubes, 12 Gauge, MR &... $96.88 Buy on Amazon
3 Carlson's Long Beard Turkey Choke Tube for Beretta Benelli Mobil Systems 12 Ga Carlson's Long Beard Turkey Choke Tube for Beretta Benelli Mobil Systems 12 Ga $48.70 Buy on Amazon
4 Carlson's Choke Tubes Remington 12 Gauge Extended Turkey Choke Tube, Black Carlson's Choke Tubes Remington 12 Gauge Extended Turkey Choke Tube, Black $30.99 Buy on Amazon

Last update on 2021-01-16 / Affiliate links / Images from Amazon Product Advertising API

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Patternmaster Code Black

Patternmaster 12ga Browning Invector Plus/Winchester SX3, SX4 Code Black Goose
Patternmaster 12ga Browning Invector Plus/Winchester SX3, SX4 Code Black Goose
$89.99
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