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03-Mar-2017 10:23

The 5.56mm M855 round has received considerable criticism for its terminal characteristics.

Detractors point out that the round fails to fragment when the striking velocity is too low – such as when fired from a very short barrel or when the bullet has slowed down thanks to its relatively unimpressive ogive shape – or when the bullet strikes the target at a very low angle of attack.

With the already proven combat success of the Mk12 SPR, the SPR concept-development team went to manufacturers in the US ammunition industry for assistance.

Industry involvement to consider this project at no cost to the government was championed by Sean Dwyer at Remington, who stated that Remington wanted to do their part on the Global War on Terrorism, and provide production capability for the ammunition, which would be developed and manufactured by Remington using bullets provided by Sierra and Hornady.

Several propellants were reviewed to provide improved powder performance, including Western Powder’s Ramshot, and submissions from Accuracy Arms and St. These companies developed powders particularly for the 6.8mm Remington SPC cartridge, and will supply quantities of the chosen propellant for final assembly of ammunition by Remington.

In terms of cartridge design within a given OAL, longer ogives come at the price of less case capacity and therefore lower muzzle velocity, but in general accepting this comes with the benefit of better velocity retention over distances beyond about a hundred meters.

In light of this, the 6.8mm SPC’s maximum ogive length is the first curiosity of the cartridge’s design.

With the already proven combat success of the Mk12 SPR, the SPR concept-development team went to manufacturers in the US ammunition industry for assistance.

Industry involvement to consider this project at no cost to the government was championed by Sean Dwyer at Remington, who stated that Remington wanted to do their part on the Global War on Terrorism, and provide production capability for the ammunition, which would be developed and manufactured by Remington using bullets provided by Sierra and Hornady.

Several propellants were reviewed to provide improved powder performance, including Western Powder’s Ramshot, and submissions from Accuracy Arms and St. These companies developed powders particularly for the 6.8mm Remington SPC cartridge, and will supply quantities of the chosen propellant for final assembly of ammunition by Remington.

In terms of cartridge design within a given OAL, longer ogives come at the price of less case capacity and therefore lower muzzle velocity, but in general accepting this comes with the benefit of better velocity retention over distances beyond about a hundred meters.

In light of this, the 6.8mm SPC’s maximum ogive length is the first curiosity of the cartridge’s design.

It uses the same case taper and shoulder angle as the 5.56mm rifle cartridge, the beta angles of those being 0.5 and 23 degrees, respectively.