6.8 Mm Ammo - The 6.8mm Remington Special Purpose cartridge (6.8 SPC, 6.8 SPC II or 6.8×43mm) is manufactured by Remington Arms in the United States. is a bottle-lock rimless intermediate rifle cartridge developed in collaboration with Army marksmanship units and members of the United States Special Operations Command.
To convert the 5.56 NATO cartridge into short barreled rifles (SBRs) and carbines. Based on the Remington .30 cartridge,
6.8 Mm Ammo
It has a bore diameter between 5.56×45mm NATO and 7.62×51mm NATO. Uses a bullet of the same diameter as the .270 Winchester hunting cartridge (usually not the same mass).
Win. Vs 6.8 Western & 6.5 Prc — Ron Spomer Outdoors
The 6.8mm SPC cartridge was designed to overcome the terminal ballistic deficiencies of the 5.56×45mm NATO cartridge that is in service with the armed forces of all NATO member countries.
The cartridge was the result of the Improved Rifle Cartridge Program. The 6.8 SPC (6.8×43mm) was initially developed by Master Sergeant Steve Holland and Chris Murray, US Army Marksmanship Unit gunsmiths.
To provide better lower range lethality than the 5.56 NATO/.223 Remington in the M16 pattern service rifle, with minimal loss of magazine capacity and slight increase in recoil.
The program began with a design using the Remington .30 case, which was modified to fit magazines that would be accommodated in the magazine wells of the M16 family of rifles and carbines in the US. In service with the armed forces.
U.s. Army Adopts True Velocity Composite Cased 6.8mm Ammunition
In tests comparing different caliber bullets using .30 Remington parts boxes, Holland and Murray determined that the 6.5mm caliber projectile had the best accuracy and penetration, based on decades of historical data from external ballistics tests and Army terminals of the United States, but the 7, mm. projectile had the best terminal. There was an exhibition. The combination of the cartridge case, powder charge and projectile easily outperformed the Soviet 7.62×39mm and 5.45×39mm cartridges, and the new cartridge proved to have a muzzle velocity of about 61 m/s (200 ft/s s) faster than 7.62 x. . 39.
The 6.8mm Remington SPC was designed to perform better in short-barreled CQB rifles after being chambered in 5.56 NATO when converted from the M16A4 rifle configuration to the Kurt M4 carbine. The 6.8 SPC delivers 44% more energy than the 5.56mm NATO (M4 configuration) at 100–300 m (330–980 ft). The 6.8mm SPC is not ballistically identical to the 7.62×51mm NATO cartridge, but has less recoil, is said to be more controllable in rapid fire, and is lighter, allowing operators to carry more ammunition than that would be possible otherwise. Large caliber rounds. The 6.8mm produces about 2,385 J (1,759 ft⋅lbf) of muzzle energy with a 7.5 gram (115 gr) bullet. By comparison, the 5.56×45mm cartridge (which was designed to replace the 6.8) generates about 1,796 J (1,325 ft⋅lbf) with a 4.0 g (62 gr) bullet, giving the 6.8mm a terminal ballistic advantage. 5.56mm 588 J (434 ft⋅lbf). One of the igmatic features of this cartridge is that it is designed for the shorter-barreled LGITH carbine rifle than the standard LGITH rifle (typically 41 cm (16 in)). The round is only 7.6-10.7 m/s (25-35 ft/s) around a barrel length of 560-610, instead of a standard 410 mm (16 in) barrel (everything else is the same). mm (22–24 in.) with no gain or loss of accuracy. It also works well on rifles with barrels shorter than 410 mm (16 in). In actual development (period 2008–2012) the performance of the SPC 6.8 increased approximately 61–91 m/s (200–300 ft/s) through work by ammunition manufacturer Silver State Armory LLC (SSA) and A. Few custom rifle manufacturers use and design proper chamber and barrel specifications. The 6.8mm Remington SPC cartridge weighs between 16.8 and 17.6 grams (259 and 272 gr), depending on manufacturer and load. Also, more appropriately, LWRC, Magpul, and Alliant Techsystems (ATK) introduced a new AR-15 designed for the SPC 6.8 that allows for 6.8 Magpul P-mags and an overall cartridge length of 5.9 cm (2.32 in). The Personal Challenge Weapon (PDW) known as the "Six8" is an SPC II with 1:250 mm (10 in) twist and is capable of using all SPC 6.8 factory ammunition.
Typical carbine trajectory data with drop and velocity calculated at sea level with a zero of 91 m (100 yd).
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Japanese Small Arms Cartridges 1900 1945
As of late 2004, the 6.8×43mm SPC was said to be performing well in the field against Amy fighters in special operations.
However, the cartridge was not used by conventional US military personnel. It was not adopted for widespread use due to resistance from officials.
The SPC 6.8 was designed for better terminal effectiveness in the short-range urban combat experienced in Iraq. As the fighting in Afghanistan began to intensify, the Gagemats began to move away, where the SPC 6.8 began to degrade. Experiments indicated that the comparatively short 6.8mm bullet became ineffective at longer ranges.
In 2007, EE Both SOCOM and the US Marine Corps decided not to field weapons chambered in 6.8 mm due to logistical and cost issues.
Spc Vs 308 Win: Which One Is Better?
Although there have been many rumors of evaluation of the cartridge by major federal and local law enforcement agencies, the US Drug Enforcement Administration has allowed individual AGTOs to acquire the M6A2 D-DEA, which uses the Remington 6-gauge SPC, 8 mm, as an authorized alternative. to his duty weapon. In 2010, Jordanian state arms manufacturer KADDB announced that it would produce 6.8mm rifles and carbines for the Jordanian military.
There is also a contract between LWRC, Magpul, Alliant Techsystems and the Saudi Royal Guard for an undisclosed amount for approximately 36,000 Six8 PDW and ATK/Federal XD68GD (90g gold dot "training" ammo) and proprietary PMmagpul 68. LWRC Six8.
The first major manufacturer to offer a Remington SPC-chambered 6.8mm version of the AR-15 was Barrett Firearms Company, which offered the Barrett M468 and later the REC7. As of 2007, most major AR-15-type rifle manufacturers offered rifles in this caliber for the civilian firearms market. Dedicated AR upper receiver assemblies for the round are made by several small companies, including Daniel Defes. Ruger Firearms no longer manufactures the 6.8mm for its Ruger SR-556 piston-action AR-15 variant.
The Stag Arms Hunter and Tactical models use new chambers (SPC II) and higher pressure loading as well as higher twist rates to accommodate higher receivers in a left-handed setup. Rock River Arms has LAR-6.8 X Series rifles and uppers. Microtech Small Arms Research offers their version of the Steyr AUG in 6.8. Robinson Armament Co. offers the XCR-L in 6.8, which is easily convertible between 6.8, 5.56 and 7.62×39. Bushmaster brought the 6.8 SPC II conversion kit to market in October 2018. Ruger Firearms had chambered their Mini-14 Ranch rifle in this round for many years; However, it was discontinued. SIG Ammunition has produced and delivered more than 825,000 rounds of 6.8x51mm composite case ammunition for testing of Prototype #2 of the U.S. Army's Next Generation Squad Weapons Program.
Sig's Lightweight 6.8 Ngsw Hybrid Ammo
Last month, SIG Ammunition delivered 825,000 rounds of its 6.8x51mm composite-cased ammunition to the U.S. Army for Prototype Test #2 of the Next Generation Squad Weapons Program. This is in addition to ammunition used for internal development and testing, in addition to previous deliveries as part of the program. In total, I would estimate that they are approaching a million rounds of next-generation hybrid ammunition.
The NGSW program will replace the M4 5.56mm carbine and M249 squad automatic weapons with new squad-level rifles and automatic rifles in close combat formations such as infantry and cavalry scouts. Other services are also monitoring the program to determine whether they want to participate.
In addition to the ammunition mentioned above, the NGSW-AR light machine gun and the NGSW-R rifles, the program also includes suppressors. Additionally, they are working with other vendor teams on a dedicated fire control system.
Ammunition is at the heart of this program. The Army gave the industry a 6.8mm projectile and a performance specification, but left it up to them how best to deliver that projectile with the required performance parameters.
More Than A Rifle: How A New 6.8mm Round, Advanced Optics Will Make Soldiers, Marines A Lot Deadlier
It turns out that the performance they are looking for is about the same as the 270 Win Short Mag. The velocity required to achieve the desired effects for that 6.8mm projectile on target requires extremely high chamber pressures of over 80,000 psi; Small arms were unknown before.
As if the ammunition is of a larger caliber than the one it is replacing, it must also be at least 20% lighter. The SIG Ammunition Hybrid design exceeds that goal at 23.5% lighter than the weight of an equivalent energy cartridge (270 WSM). Below you can see the hybrid case next to the traditional brass cased ammo.
This is not a science project. The Army plans to find a solution by next year. While the engineering alone is daunting, the industry must also be able to actually produce the munitions and weapons they design, if chosen.
The need led to some interesting solutions. from
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