.410 bore
| .410 bore | |
|---|---|
 | |
| Type | Shotgun, Revolver |
| Production history | |
| Produced | 1900 onwards |
| Specifications | |
| Overall length | 3.0 in (76 mm) |
.410 bore, commonly misnamed the .410 gauge, is the smallest gauge of shotgun shell commonly available. It has similar base dimensions to the .45 Colt revolver cartridge, though the .410 is significantly longer, up to 3 inches (76 mm) in length), allowing many single-shot firearms and some revolvers chambered in that caliber to fire shot without any modifications.
Origin
The .410 is a relative latecomer in shotgun sizes. It appears to have become popular around 1900. Some suspect that this shotgun arose from converted rifles of a similar bore diameter. The first ammunition was two inches (5.08 cm) in length, compared with the modern 2.5 and 3.0-inch (76 mm) sizes.
Naming
Pronounced four-ten, the .410 shotgun is a bore and not a gauge because the barrel diameter is .410 inches (10.4 mm); a true gauge is a measurement of the number of lead balls of bore diameter that constitute a pound (454 grams). The .410, when measured by gauge, would be around 67 or 68 gauge,[1], not the sometimes mistakenly assigned 36 gauge. A true gauge measuring .410 would have a 2.25 inch (57 mm) bore. In the US, the .410 is the only popular shotgun cartridge named by bore rather than gauge, though it is often referred to as a four-ten gauge. In the United Kingdom and other English speaking countries, all shotgun sizes are called bore, whether measured by gauge or bore diameter.
Uses
As the smallest of traditional shotgun sizes, .410 bore guns throw the least weight of shot, but are very easy to handle. This results in a very low recoil, so the .410 is often chosen for young shooters, who might have problems with a heavier recoiling shotgun. Some shooters however do discourage the use of the .410 as an introduction for young shooters, both because the negligible recoil does not familiarize the beginners with the heavier recoil of larger cartridges such as the 12 gauge, and because of the difficulty in hitting moving targets with the small charge of shot used by the .410. Others believe starting young/new/small shooters with large recoiling guns will cause a habit of flinching and negatively affect their accuracy.
Some competitive shooters choose the .410 bore because of the challenge it presents; .410 bore guns generally have full chokes to form a tight pattern with the small load of shot, and this makes hitting moving targets very challenging. By using sub-gauge inserts, a 12 gauge break open action can be temporarily converted down as far as a .410 bore to provide additional challenge when training, or to handicap the shooter.
The .410 bore is also commonly used for small game animals such as squirrels and rabbits, where the small diameter patterns of a full choke are less problematic than with birds.
Due to the inaccuracy compared to other shotguns, the .410 bore is often used for "Plinking".
The .410 bore is considered far inferior to the traditional 12 gauge shotshell for defensive use[2], though a number of companies market defensive guns chambered in .410, such as the Mossberg 500 Home Security model. Defensive ammunition is harder to find, since most .410 bore shells are loaded with birdshot. American Derringer and Winchester market .410 bore 000 buckshot with 5 pellets in 3-inch (76 mm) and 3 in 2.5-inch (64 mm) shells[3][4], compared to the 12 pellets in a 3 inch 12 gauge, or 9 00 pellets in a 2¾ inch 12 gauge. With slug loads, the .410 bore compares better, with about 750 ft·lbf (1,020 J) of muzzle energy, comparable to a .44 Magnum handgun loading[5].
Survival arms
The small size of the .410 bore makes it popular for use in compact firearms carried for emergency use. Commonly these are combination guns, with a .22 Hornet or .22 rimfire rifle barrel mounted over a .410 bore shotgun barrel. The most famous of these is the M6 survival rifle made by Springfield Armory, Inc. for the US Air Force, and a number of copies are made by other makers. The original has a 14-inch (360 mm) barrel, the same length as the stock, and folds in half for storage, making a compact package. With the short barrel, this is classified as a short barreled shotgun in the United States, so 18.5-inch (470 mm) barreled models are made for civilian sales, as well as a 16-inch (410 mm) pistol version in .22 over .45 Colt.[6] Special flare cartridges in .410 were issued with the USAF model.
The Thompson Center Arms Contender pistols are commonly encountered with a special .45 Colt/.410 bore barrel. The barrel is rifled for the .45 Colt, but has a special choke and vent rib to make it function as a shotgun. Due to the rifled barrel, the assembled firearm is considered a rifle or pistol (depending on barrel length) and thus is not subject to the National Firearms Act 18-inch (460 mm) minimum barrel length.[7]
Handguns
The fact that the .410 bore shell fits in a .45 Colt chamber has resulted in some unusual applications. While shotguns are often limited in minimum length, a firearm chambered in .45 Colt, such as the Contender pistol, is not defined as a shotgun even though it can chamber shotgun shells. American Derringer has long offered .45 Colt/.410 bore Derringers[8], and recently Taurus and Magnum Research both began to offer revolvers with extended cylinders, chambered for .45 Colt but long enough to hold .410 shells as well. Magnum Research's is an expensive single-action model in their BFR (Biggest, Finest Revolver) line, while the inexpensive Taurus Judge is similar in price to their other double-action revolvers. The now discontinued MIL Thunder 5 was also chambered in .410-bore.
References
- ^ Barnes, Frank C. (2006) [1965]. Skinner, Stan (ed.). Cartridges of the World (11th Edition ed.). Iola, WI, USA: Gun Digest Books. p. 502. ISBN 0-89689-297-2.
{{cite book}}:|edition=has extra text (help) - ^ Chuck Hawks' updated rec.guns FAQ on defensive ammunition
- ^ Winchester .410 buckshot
- ^ American Derringer .410 buckshot
- ^ Federal .410 bore slug #F412RS, 762 ft·lbf (1,033 J), vs. .44 Magnum #P44HS1, 780 ft·lbf (1,058 J)
- ^ S. P. Fjestad. Blue Book of Gun Values, 13th Ed. Blue Book Publications.
- ^ "G2 Contender Pistols". Retrieved 2007-09-20.
- ^ American Derringer model 1
External links
- The Shotgun Report review of the Remington 870 in 28 gauge and .410 bore
- The .410 Bore by Chuck Hawks
- The .410: What Good Is It? by Randy Wakeman