The .310 Cadet, also known as the .310 Greener, or the .310 Martini, is a

centerfire Two rounds of .357 Magnum, a centerfire cartridge; notice the circular primer in the center A center-fire (or centerfire) is a type of metallic cartridge used in firearms, where the primer is located at the center of the base of its casing (i. ...

rifle A rifle is a long gun, long-barreled firearm designed for accurate shooting and higher stopping power, with a gun barrel, barrel that has a helical or spiralling pattern of grooves (rifling) cut into the bore wall. In keeping with their focus o ...

cartridge, introduced in 1900 by

W.W. Greener W.W. Greener is a sporting shotgun and rifle manufacturer from England. The company produced its first firearm in 1829 and is still in business, with a fifth generation Greener serving on its board of directors. History The history of W.W. Gree ...

as a

target Target may refer to: Warfare and shooting * Shooting target, used in marksmanship training and various shooting sports ** Bullseye (target), the goal one for which one aims in many of these sports ** Aiming point, in field artille ...

round for the

Martini Cadet The Martini Cadet is a centrefire single-shot cadet rifle produced in the United Kingdom by BSA and W.W. Greener for the use of Australian military Cadets. Although considered a miniature version of the Martini–Henry, the internal mechanism wa ...

rifle. Firing a 120

grain A grain is a small, hard, dry fruit (caryopsis) – with or without an attached husk, hull layer – harvested for human or animal consumption. A grain crop is a grain-producing plant. The two main types of commercial grain crops are cereals and ...

heeled lead projectile at 1350

ft/s The foot per second (plural feet per second) is a unit of both speed (scalar) and velocity (vector quantity, which includes direction). It expresses the distance in feet (ft) traveled or displaced, divided by the time in seconds (s). The corresp ...

the round is similar in performance to the .32-20 Winchester and some rifles may chamber both rounds with some accuracy. The full metal jacketed round was used in cadet rifles in Australia and New Zealand after early 20th-century Defence Acts. In New Zealand, after the start of the Boer War, a cadet corps had been started; by 1901 it was recommended that membership be compulsory. 500 Westley-Richards miniature Martini–Henry rifles were available by October 1902 (Auckland Star), and 5000 by April 1903 (Star). Such rifles gained popularity in

Australia Australia, officially the Commonwealth of Australia, is a country comprising mainland Australia, the mainland of the Australia (continent), Australian continent, the island of Tasmania and list of islands of Australia, numerous smaller isl ...

New Zealand New Zealand () is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and List of islands of New Zealand, over 600 smaller islands. It is the List of isla ...

and the

United States The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...

when thousands of Martini Cadet rifles were sold by the

Australian government The Australian Government, also known as the Commonwealth Government or simply as the federal government, is the national executive government of Australia, a federal parliamentary constitutional monarchy. The executive consists of the pr ...

after

World War II World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...

. A shorter version used as a humane killer was used in pistols. Known as the .310 cattle killer, invented by WW Greener, it was shorter in that a .310 cadet could not be accidentally chambered into the humane killer pistol.

Current Use

After being sold by the Australian government many were converted to sporting or target rifles, often re-barreled to calibers like .22 Hornet, .218 Bee, .25-20 Winchester, .222 Rimmed,

.357 Magnum The .357 Smith & Wesson Magnum, .357 S&W Magnum, .357 Magnum, or 9×33mmR (as it is known in unofficial metric designation) is a smokeless powder cartridge with a bullet diameter. It was created by Elmer Keith, Phillip B. Sharpe, and Douglas B. ...

and others to .22 rimfire by gun makers like

Sportco Sportco was an Australian manufacturer of rifles and shotguns in Adelaide, South Australia, from 1947 until the early 1980s. Founded by Jack Warne, also known by its full name Sporting Arms Limited, began by manufacturing single shot 22LR rifles. ...

. Those still using the .310 Cadet have to either buy cases to reload, by Bertram Bullet Co. in Victoria, Australia, or several small independent ammunition makers in Australia and the United Kingdom. However these new .310 Cadet cases are 3-4 times as expensive as new .32-20 Winchester cases, hence shooters modify .32-20 cases, as a cheaper alternative. Modifications involve length resizing, and in most cases reducing the rim thickness. Due to the .310 using a heeled projectile, the neck thickness of the .32-20 does not have to be reamed down, after first being case length resized to 1.075" (27.3 mm). Most .310 cadet chambered rifles need to have the rim of the .32-20 case reduced from 0.065" to 0.045" (1.7 mm to 1.14 mm), to allow proper head spacing and operation of rifle. However, in the unusual instance of a lever action .32-20 fitted with a .310 barrel, the rifle will cycle better without the case rim thickness being reduced. As home reloading is the main option for the .310, many shooters play with different case length reduction of the .32-20, anywhere from 0.875'' to 1.185'' (22.23 mm to 30.10 mm).

Dimensions

Gallery

References

External links

Martini–Henry Site
{{DEFAULTSORT:310 Cadet Pistol and rifle cartridges British firearm cartridges Weapons and ammunition introduced in 1900

Current Use

Dimensions

Gallery

See also

References

External links