6.8x43mm SPC (Special Purpose Cartridge)
The 6.8x43mm SPC (Special Purpose Cartridge) was conceived by a US Army 5th Special Forces Group soldier in a quest to improve the terminal ballistics of the M4 Carbine. The U.S. Army Marksmanship Unit and others assisted the Spec Ops team heading the project. Although the main objective was increased lethality, the new cartridge would go far beyond that in terms of accuracy and performance.
The 6.8mm [.270 military cartridge] Remington SPC cartridge was developed to provide increased lethality and better long range capability than current 5.56mm NATO or 7.62x39 through higher energies. The shell body diameter is larger than 5.56mm NATO but smaller than 7.62x39. The cartridge length is the same as 5.56mm NATO. The modular approach of M16 weapons family allows use of 6.8mm Rem SPC cartridge with dedicated upper receiver and magazine.
The 6.8mm Remington SPC is available with 115 gr Hornady Open-tipped match (OTM), 115 gr Sierra HPBT Match and 115 gr FMJ. Muzzle velocity is 2800 ft/s from a 24" barrel, 2625 ft/s from 16" barrel and 2475 ft/s from a 12" barrel, with 1 MOA dispersion typical. The chamber pressure is 55,000 psi MAP via conformal transducer. 28 rds of 6.8mm Rem SPC - 115 gr OTM weighs ~1.06 lbm, 30 rds 5.56mm NATO - 62 gr FMJ weighs ~0.76 lbm, 20 rds 7.62mm NATO - 150 gr FMJ weighs ~1.07 lbm.
Remington 6.8mm SPC can be used with existing M16/M4 lowers with dedicated upper receiver and magazines. The 6.8mm Rem SPC offers higher energy for improved down range performance versus 5.56mm NATO and 7.62x39. Terminal performance in gelatin has been illustrated at 25 feet with short barreled weapons and at 50 yds with intermediate length barreled weapons. The 115 gr Hornady OTM provides for greater and more immediate temporary expansion cavity. The 6.8mm Rem SPC has been submitted to SAAMI.
By late 2004 the 6.8x43mm SPC was said to be performing well in the field against enemy combatants. Special Operations end users were reported to be very pleased with it.
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