.408 Cheyenne Tactical designated 408 Chey Tac (10.36ÃÆ' â € "77mm) by C.I.P. is a cartridge, a special rimless centerfire, a bottleneck, for military long-range sniper rifles developed by Dr. John D. Taylor and William O. Wordman engineer. This round is designed with possible military needs for cartridges for anti-personnel, anti-snipers and anti-material roles with precision (precision) 2,200 meters (2,000 m). It is offered as a competitor for the most common long-term NATO military services such as.338 Lapua Magnum and.50 BMG.
Video .408 Cheyenne Tactical
Histori
The 0.408 Cheyenne Tactical is based on the Taylor Magnum 0.400, which is based on a modified 0.550 Gibbs, down to 0.408 inches (10.36 mm). The.505 Gibbs is a great old English game cartridge designed to accommodate 39,160 psi (270 MPa) pressure. One disadvantage for these old cartridge cases is meant to shoot the cost of cordite instead of the modern smokeless powder is the only side wall thickness advanced to the web. During ignition, the base of the cartridge, forward to the face of the bolt, is not supported. The casing is pushed back towards the bolt that results in stretching the casing, especially the side wall that directly leads to the front of the web. When the sidewall holds out the expansion of space, the pressure extends across the chassis increasing its length so that the side wall becomes thinner at that point.
In.408 CheyTac cartridge casing design, special attention is directed to the thickening and hardening of metallurgical web cases and side walls are immediately forwarded to the web to accommodate high room pressures. In the case of modern solidheads, brass hardness is the main factor that determines the case pressure limit before undergoing plastic deformation. Lapua Ltd. solved this problem when they used.416 Rigby as a parent case to.338 Lapua Magnum. They create violent distributions ranging from head and web (hard) to the mouth (soft) as well as strengthened case networks (thicker) and side walls directly in front of the web. This method produces a very stress-resistant case.
Maps .408 Cheyenne Tactical
Cartridge dimensions
The.408 Cheyenne Tactis became officially registered by the Internationale Permanente Commission pour l'Epreuve des Armes ÃÆ' Feu Portatives (C.I.P.) on May 15, 2013 which ended its status as a wildcat cartridge.
The408 Cheyenne Tactis has 10.32 ml (159 grains H 2 O) cartridge container capacity.
.408 Cheyenne Tactical maximum C.I.P. dimensional cartridges. All sizes are in millimeters (mm).
America will determine the shoulder angle in alpha/2? 22.13 degrees. The general rifling round rate for this cartridge is 330.2 mm (1 in 13 inches), 8 indentations, ÃÆ'ËÅ" soil = 10.16 mm (0.400 in), ÃÆ'ËÅ" grooves = 10.36 mm (0.408 in), width = 2 , 57 mm (0.1 inches) and the primary type is a large rifle.
According to officials of C.I.P. (Internationale Permanente Commission pour l'Epreuve des Armes ÃÆ' Feu Portatives) decree.408 Cheyenne Tactis can handle up to 440.00 MPa (63,817 psi) P max piezo pressure. At C.I.P. countries set up each combo of rifle cartridges should be proven on 125% of this maximum CI. pressure for certification to be sold to consumers. This means that.408 Cheyenne Tactical armory in C.I.P. regulated current state (2016) evidence tested at 550.00 MPa (79.771 psi) PE piezo pressure.
.408 Cheyenne Tactical as parent case
The408 CheyTac serves as the host for several second generation wildcat cartridges.
By blowing out.408 cases the CheyTac wildcatter plant generally hopes to get an extra muzzle velocity by increasing the case capacity of the factory master cartridge box by up to a few percent. Practically there can be some muzzle velocity obtained by this method, but the measured results between the parent cartridge and the offspring of their "corrected" wildcat are often marginal. An example of the Chave variant.408 exhaled is.408 Baer.
In addition to changing the internal shape and volume of the parent cartridge box, wildcatters can also change the original caliber. Because.408 CheyTac offers a large and sturdy cartridge case, pressure resistant has become very popular among wildcatters. With.408 CheyTac as the parent case wildcatters have created.338 (.338 Little Dave 8.5ÃÆ' â € "55,.338 Snipe-Tac, 338/408 Baer),.375 (.375 CheyTac,.375-.408 CheyTac,.375 Snipe-Tac,.375 SOE),.416 (.416 PGW), and.510 (.510 Snipe-Tac) caliber variants. In 2007, the 0.325 inch (9,525 mm) caliber variant seemed to attract the most attention. The company that designed the CheyTac Intervention rifle, CheyTac, LLC, itself offers a rifle in the 0.375 CheyTac space in their 2007 retail price list.
Projectile (bullet)
For the most part, 408 CheyTac mill munitions use solid projectiles or bullets rather than jacketed core bullets, which are common to most other rifle bullets. The oldest factory.408 CheyTac ammunition uses a bullet designed by Warren S. Jensen and produced by Lost River Ballistic Technologies. Currently (2009) this projectile is manufactured by Jamison International, where they are turned on a Swiss CNC lathe from a solid copper nickel alloy rod. The plant claims that their diameter is accurate to "one 50 million" but does not provide a unit of measurement with this claim, making it somewhat vague. One negative side of the use of mono solid metallic projectiles is that they tend to increase residual fouling in the gun barrel after being fired. Because the bullet was harder and harsher than the normal jacketed metal jacket plating, the bullet was made slightly "small" so that it could be effectively gripped by the long-barreled gun. This inevitably reduces the bullet seal in the barrel, allowing hot gunpowder to reach the side of the projectile, evaporating some materials and storing it in the hole.
Other manufacturers, such as Rocky Mountain Bullet Companies/Vigilance Guns, GS Custom Bullets, Lehigh Bullets & amp; The design, Lutz MÃÆ'¶ller and TTI Armory have developed a very-low-tension core or mono project for CheyTac.408.
In 2007 Dr. John D. Taylor designed a new class of armor-penetrating projectiles called.408 CheyCorey and in this configuration, it outperformed.50 AP cartridges (both black and silver) against armor and titanium armor. The projectile has a mass of 370 grains (24.0 g). The AR500 certified steel penetration claims are 1 inch (2.54 cm) at 100 meters (91.5 m) and 1/2 inch (1.27 cm) at 775 yards (708.8 m).
In 2008 the factory loaded.408 CheyTac 420-grain (27.22 g) leads a core bullet with 955 copper jackets becoming available. Very low drag rackets are made by Rocky Mountain Bullets in Philipsburg, Montana and have rebated boattail and a claimed ballistic coefficient (BC) of 0.874.
The CheyTac 408 munitions factory is expensive, ranging from about $ 7 per turn with Jamison International 419-grain (27.15 g) very low-drag-pull.
The ballistic coefficient of Jamison 419-grains (27.2 g) projectile
Cheyenne Tactical claims the coefficient of G1 coal which is measured Doppler (BC) for Lost River Ballistic Technologies/Jamison International 419-grain (27.15 g) bullet of about 0.934 and BC expressed for 305-grain bullets (19.76 g) of 0.611, This framework has been disputed by a number of knowledgeable sources. The Extreme Weapons claim the same G1 BC.408 CheyTac projectiles averaged 0.945-2000 meters and dropped to low 0.900s to 2800 meters. The 408 CheyTac projectile remains supersonic for up to 2,300 meters (2,100 m) according to Extreme Firearms. CheyTac LLC claims that the 26.95 gram projectile (419 gr) has a supersonic range of 2,200 meters (2,011 m) under 'standard air conditions'. The average ballistic coefficient of 419 grains (27.15 g) is 0.945 above 3.825 meters (3,500 m). Jamison International stated G1 BC from this bullet on their current website (2009) at 0.940.
The above variations can be explained by the difference in the ambient air density used for this BC report or the different velocity measurements in which the average G1 BC is based. BC changes during the projectile flight and states BC is always average for a particular speed range regime. Some further explanation of the transient nature of G1 BC projectiles (rising above or getting below the average value stated for a particular speed range regime) during flight can be found in external ballistic articles. This article implies that knowing how BC was founded is almost as important as knowing the value of BC which is stated itself.
Balanced-flight/controlled-spin projectile
Lost River Ballistic Technologies (statement of Mr. Warren Jensen) states that ".408 CheyTac is the first bullet/firing system to use what they call a balanced flying projectile.To achieve a balanced flight, the linear obstacle must be balanced with rotation, drag to keep the nose very smooth (meplat) from a bullet directed directly into the approaching air.This will produce very little precession and yaw at extreme distances and allow accurate flight back through the transonic region.This is difficult to achieve for small arms, projectile.Your mathematical, are in a very unfavorable position by trying to reach a balanced flight with the main non-mono nuclear core bullet. "The mass ratio/surface rotation is too high." [2]
Patent of a balanced aviation projectile can be found at the US Patent Office, controlled rotary projectile, US PAT No. 6,629,669 . According to the patent, a projectile carved and launched in accordance with the patent shall reduce the speed of supersonic flight through transonic to subsonic in a stable and predictable manner effective for distances above 3000 yards (2,743 m). This implies that among some other prerequisites the gun barrel must have a special stirrer dimension to achieve the desired axial amount of axial air on the bullet surface, which reduces the level of the bullet spin to reach a balanced flight. Patents do not take into account the differences that usually occur in air density. More about a balanced flight can also be found at CheyTac Information Papers.
Patent Balanced Flight/Controlled Projectile bullet has been questioned/debated by the German physicist Lutz MÃÆ'¶ller. Mr. MÃÆ'¶ller realizes that a balanced flight deals with aviation properties and stable parameter scales. There are projectiles produced before patents that remain stable through the transonic flight regime. This is a consequence of the rotation deceleration and the forward deceleration of a projectile that is similar enough to not cause unwanted precession and yaw during the transonic flight phase. The main parameters for achieving a stable transonic transition are controlling the drag coefficient (C d ) and the loss of forward velocity around Mach 1 and to the lower level controlling the rotation deceleration. In other words, any bullet with proper drag behavior around Mach 1 and mass (distribution) will do exactly what is called a balanced bullet fly statement.
Performance
The cartridges provide accurate performance (sub-MOA) of the sniper rifle. The Lost River Ballistic Technologies/Jamison International 419-grain (26.95 g) very-low-drag bullet is the standard, sniping load remotely.
Lost River Ballistic Technologies also designed 305 bullet (19.76 g) bullets for Battlefield Domination Round (BDR). BDR is loaded with 305 grain bullets (19.76 g) (claimed G1 BC = 0.612) and is intended for short and medium range applications using the point-blank range method.
Supersonic range
For a typical CheyTac 0.408 fueled gun, shoot 27.15 grams (419 grams) of Lost River Ballistic Technologies (claimed G1 BC = 0.940) at 884 m/s (2900 ft/sec) muzzle velocity, the supersonic range would be 1930 m (2110 yd) under the International Standard Sea Sea (air density = 1,225 kg/mÃ,³).
For a typical 0.375 CheyTac rifle, shoot 24.30 grams (375 grams) of Lost River Ballistic Technologies (claimed G1 BC = 1.02) at a muzzle speed of 930 m/s (3050 ft/s), the supersonic range would be 2230 m ( 2440 yd) under International Standard Sea Sea (air density = 1,225 kg/mÃ,³).
Improvements beyond these standards while still using standard.375 CheyTac brasses are possible, but bullets must be very long and the overall length of the normal cartridges must be exceeded. General rifling rotational speed.375 CheyTac 292 mm (1: 11.5 in) should also be tightened to stabilize very long projectiles. Use of such a 0.375 CheyTac-based cartridge demands the use of a custom rifle or adapted to the proper cut room and quick rotary hole. Examples of extreme caliber of extreme.375 caliber are German CNCs producing mono-metal 26.44 grams (408 gr).375 Viking (G1 BC 1.537) The Ballistic coefficient (BC) is calculated by the designer, Mr. Lutz MÃÆ'¶ller, and is not proven with Doppler radar measurements). This bullet has shown the problem of dynamic stability and is no longer produced. The.75 Viking bullet has an overall length of 70 mm (2.756 inches) and lowers the anticipated low attractiveness of the HaD radical or Sears-Haack profile in the bullet nose area. The rifles used for this wildcat cartridge, with an overall cartridge length of 119 mm (4,685 in), have been fitted with a specially crafted 203 mm (1: 8 in) taper barrel.
In theory, Mr. MÃÆ'¶ller calculates that a typical 0.375 CheyTac rifle, fired a dead bullet 26.44 grams (408 gr).375 Viking bullets (claimed G1 BC = 1,537) at 870 m/s (2854 ft/s). ) muzzle velocity, will have a supersonic range of 3090 m (3380 yd) under sea level International Standard (air density = 1,225 kg/mÃ,³). However, field testing of this projectile proves it is completely unstable, and is useless at any speed or range. It was founded in February 2009 by Terry Holstine, a Oklahoma State Trooper, who was the only person who ever fired the Vikings. Apparently Mr. MÃÆ'¶ller does not test this projectile before a public release where dynamic instability will be found.
Chambers Availability
The408 Cheyenne Taktis bilik yang ditawarkan untuk senapan pabrik ini:
- Beretta - Victrix Armaments "Tormentum"
- BCM Europearms S.a.s.
- CheyTac Intervention rifle series - CheyTac LLC.
- E.D.M. Senjata XM04
- PGWDTI Timberwolf.408 CheyTac dan.416 PGW rifle - Prairie Gun Works Defense Technologies Inc.
- Mesin Lawton LLC. (Lawton Rifle Barrels)
- Lobaev Sniper Rifle
- senapan presisi G.A.C
- RND Manufacturing, Inc.
- Tactilite T1 (satu-shot) AR-15.408 Chey Tac atas
- THOR XM408
- Senapan Vigilance VR1
- Desert Tactical Arms HTI
- Cadex Defense Shadow
Some special tactical bolt action and high quality (semi) lighters are designed for.408 Cheyenne Tactical cartridge and became available in 2007. This semi-indentative bolt action is used with other high-class rifle and vision components to build special sports and rifle targets. Such rifles are ordered by the shooters oriented to long-range accuracy and are built by highly skilled special thieves and can cost thousands of dollars. When built to hope the rifle is very accurate - 0.5 MOA or better consistent accuracy for optimized shotgun ammunition is considered normal. Only expert shooters can take advantage of this extreme accuracy potential.
See also
- .505 Gibbs
- CheyTac Intervention
- caliber 10 mm
- .338 Lapua Magnum
- .416 Barrett
- List of sniper rifles
- List of individual weapons of the U.S. Armed Forces.
- Hand and rifle handguns
References
- .408 Cheytac Intervention in World of Firearms
- .408 CheyTac Travel Report, Shooter Observations and Test Results by Dean Michaelis
- Barrett.416 vs. Cheyenne Tactical.408
- Precision Rifle 408 Cheytac Project
External links
- CheyTac Website
- Controlled play projection on Google Patent
- Quo Vadis GmbH web page at.408 Chey Tac (including images)
- Jamison International
- LOBAEV ARMS
Source of the article : Wikipedia
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