22-Oct-2026
They do, and the difference is bigger than the small stamp on the tube suggests. A choke tube is a short, threaded insert at the muzzle that narrows the barrel by a carefully chosen amount, and that narrowing decides how tightly your shot cloud holds together as it travels. Tubes range from wide open to very tight, and picking the right one for the bird, the range, and the cartridge can make a real difference to your day. This guide explains what the constrictions are called, what each tends to do, and how to use them sensibly.
What is a choke tube, and what does constriction mean?
A choke is a gentle narrowing at the end of the barrel. Constriction simply means how much the bore closes in at that point. The more constriction, the more the shot charge is squeezed together as it leaves the muzzle, and the longer the pattern stays compact. The less constriction, the sooner the pattern spreads out into a wide, forgiving cloud.
On older guns, the choke is part of the barrel itself and cannot be changed. On most modern shotguns, the muzzle is threaded to accept interchangeable tubes, often called multichokes. These let you change the constriction in a minute or so, without changing guns. That flexibility is why so many shooters like them: the same gun can be set up for a close-range rough shoot on Saturday and for clay pigeons on Sunday.
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What are the different constrictions called?
British shooters usually talk in the traditional names. Cylinder is the most open, with little or no constriction. Improved cylinder narrows the bore a little. Half choke, which is often marked as modified, sits in the middle. Three-quarter choke is tighter again, and full choke is the tightest of the usual set. Some makers add quarter choke and other in-between sizes, and some use extra-full or specialist tubes for particular disciplines.
Two things are worth knowing. First, the names are a general guide and not a precise measurement, so one maker’s half choke can differ slightly from another’s. Second, tubes are marked in different ways: notches or grooves on the rim, stars, numbers or letters, depending on the maker. Your gun’s manual is the reliable key to its own markings, and a gunsmith or dealer can confirm anything unclear.
It is also worth remembering that choke is only one part of how a pattern behaves. The cartridge, the shot size, the wad, and the barrel all play a part, which is why two identical tubes can throw slightly different patterns in different guns.
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How does the constriction change the pattern?
Think of the shot as a cloud that expands the further it travels. A more open choke lets that cloud widen earlier. At close range, this gives you a generous spread, which is helpful because a slightly imperfect shot still finds the bird. A tighter choke keeps the cloud denser for longer, so it tends to hold together better at greater distance, but it gives you a smaller target of shot at close range and so less margin for error.
That is why many people reach for more open tubes for close, fast birds and for tighter ones for distant targets. It is a trend and not a rule, and plenty of good shooters happily use a moderate choke for almost everything. If the pattern is too tight for the range, birds can be missed cleanly or damaged, and if it is too open for a long shot, there can be too few pellets where you need them.
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Which tube suits which kind of shooting?
For driven game, most guns favour fairly open to medium tubes, because birds are taken at a spread of ranges and a forgiving pattern helps. For walked-up and rough shooting, where shots are often close and quick, open tubes are popular too. Clay shooting varies by discipline: a close, fast target and a distant crossing target call for different thinking, and clay grounds and coaches can tell you what the regulars favour for each. Pigeon shooting over decoys often suits a medium setup, while longer shots may justify a little more constriction.
Treat all of this as a starting point. The bird, the distance, the cartridge and your own style all feed in, and what works well for a friend may not suit you. Ask the shoot, your host, or a coach what the usual birds look like and choose from there. The most honest way to find out what your gun likes is to pattern it, which means firing at a large sheet of paper under supervision at a clay ground or with a gunsmith, and looking at where the shot lands.
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How do you look after choke tubes and use them safely?
A few simple habits go a long way. Only use tubes made for your gun, and do not mix tubes between makers or models unless the maker says it is fine, as threads and lengths differ. Fit each tube with the correct choke key, tighten it as the maker advises, and check it again during a long day because tubes can work loose. Keep the threads clean and lightly lubricated as recommended, and wipe the tube and the barrel thread after wet days. A tube that is stuck, damaged, or cross-threaded should go to a gunsmith, not be forced.
Never fire a multichoke gun without the correct tube fitted properly. If you are unsure whether a tube is suitable for a particular cartridge, ask the maker. This matters most with non-toxic shot, where different shot materials behave differently, and some constrictions are not recommended for certain loads. The shoot’s own rules and the cartridge and gun makers’ guidance should come first. Our guide to alternatives to lead ammunition is a useful place to start.
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Choke tubes when you buy or sell a shotgun
When buying a used shotgun, ask which tubes are included and what they are. A good set in clean condition adds real practical value, especially if you want a gun for more than one kind of shooting. Look at the threads, check the tubes seat properly, and have a gunsmith look at anything that seems tight, rough, or worn. On an older gun with fixed chokes, check the markings and ask what the previous owner used it for.
If you are selling, say clearly whether the chokes are fixed or interchangeable, which tubes come with the gun, the barrel length and the chamber length, and include a photo of the muzzle end and the tube markings. Buyers often look for exactly this detail, and a clear listing builds confidence. Our guides to shotgun fit and chamber lengths cover two other points worth checking before you buy.
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FAQ
Are choke tubes interchangeable between shotguns? Not as a rule. Threads, lengths, and designs differ between makers and sometimes between models, so use tubes made for your gun and check with the maker or a gunsmith if you are unsure.
What is the difference between improved cylinder and modified choke? Improved cylinder has a little constriction and gives a wider, more forgiving pattern. Modified, also called half choke, is tighter and keeps the pattern together for longer. The exact amounts vary slightly by maker.
Which choke tube is best for pheasant? Many shooters favour open to medium tubes for driven game, but the best choice depends on your gun, cartridge and the birds on the day. Patterning your gun and asking the shoot or a coach is the most reliable guide.
Can I use any choke with non-toxic shot? Not necessarily. Some tubes and constrictions are not recommended for certain non-toxic loads, so follow the gun maker’s and cartridge maker’s guidance and the shoot’s rules.
Ready to find your next shotgun?
Whether you want a gun with a flexible set of multichoke tubes or a classic with fixed chokes, the best way to decide is to compare real guns. Browse the latest shotguns for sale on Rightgun.uk, look through gun parts and accessories, or list your own gun for other UK shooters to find. If you are unsure about a particular gun or tube, ask a gunsmith or the maker.
Further reading: Shotgun fit, Shotgun chamber lengths explained, Cartridge selection and Alternatives to lead ammunition
