How Do Choke Tubes Work in Shotguns?

Inserting the Choke Tube

A choke tube is inserted into the barrel of a shotgun by means of threads. Both the shotgun barrel and the choke tube feature threads cut into the metal. These threads may be either universal or specific to a particular type of shotgun. It is important to make sure the correct choke tube is used for the right gauge shotgun. The tube is first threaded by hand into the barrel of the shotgun, then seated with the use of a choke wrench.

How Choke Tubes Work

Choke tubes are designed to alter the dispersal pattern of the shot as it leaves the barrel of the shotgun. Depending on the type of choke, such as full or modified, the resulting pattern of shot will either be wider or more compact down range. For example, a full choke will produce a tight and more concentric grouping of shot at a target down range than that of a modified choke. The basic choke designations are, from least constricting, the cylinder, modified and full. However, there are also skeet, improved cylinder, skeet 2, improved modified, extra full and turkey. Turkey choke tubes will produce the tightest grouping of shot at the greatest distance.

Considerations

When determining the best choke tube for a particular situation, it is important to remember that there are factors that may affect shot performance regardless of the choke chosen. The first thing to remember is that a shotgun will typically produce a slightly different pattern each time it is fired. This is the result of the shot in the shotgun shell moving independently down range. Weather conditions can also affect the pattern of shot, especially in rain and snow. Dirt and debris in the choke tube itself can affect the pattern of shot. This is why it is important to periodically clean the tube while shooting. There can also be deviation between different manufacturers in regard to quality, powder, shot and manufacturing.