Shotgun Choke Tubes Explained

by Keith Allen
A choke tube system changes the shot dispersion of a shotgun.

A choke tube system changes the shot dispersion of a shotgun.

Shotgun choke tubes fit in the interior of the end of a shotgun barrel. These removable tubes control the dispersion of the shot fired from the shotgun. Changing the dispersion of the shot is useful if the same gun will be used in multiple sports, such as trap and skeet, or used in hunting different species of game, according to the website gunnersden.com.

Shotgun Chokes

Standard chokes for a shotgun are cylinder, improved cylinder, modified, improved modified, full and extra full. Cylinder choke indicates no choke effect and is the most open choke, providing the widest dispersion of shot as it exits the barrel. Extra full is the tightest choke and concentrates the shot into the tightest pattern.

Effective Patterns

The shot fired from a cylinder choke-equipped gun will place 70% of the shot within a 30-inch circle at a distance of 25 yards. The modified choke type will create a 70% shot pattern in 30 inches at 35 yards. The extra full choke tube accomplishes the same thing at a distance of 45 yards.

Advantages and Disadvantages

The idea is to have the optimum shot pattern. If the optimum shot pattern occurs at 25 yards and the target is at 45 yards, the shot will disperse too much to place enough shot on target. Conversely, If an extra full choke tube is used, creating the ideal shot pattern at 45 yards, then a target at 25 yards will be more difficult to hit.


The first system of interchangeable chokes was developed by Winchester Firearms in 1959 but discontinued in 1965 due to problems. It was improved and reintroduced in 1970 and marketed under the Winchoke name. Other manufacturers have also developed their own line of choke tube systems.


Choke tubes are standard on some guns or can be installed by a qualified gunsmith. Some sportsmen purchase a complete set of six choke tubes while others purchase two or three tubes that fit their hunting or shooting needs.

About the Author

Keith Allen, a 1979 graduate of Valley City State College, has worked at a variety of jobs including computer operator, medical clinic manager, radio talk show host and potato sorter. For over five years he has worked as a newspaper reporter and historic researcher. His works have appeared in regional newspapers in North Dakota and in "North Dakota Horizons" and "Cowboys and Indians" magazines.

Photo Credits

  • man shooting a shotgun image by caraman from Fotolia.com