: It delivers approximately 44% more energy than the 5.56mm NATO at ranges of 100–300 meters.
: Developed in the early 2000s, the cartridge was based on the .30 Remington case, necked down to accept a .277-inch bullet. 6.8 / 10 WarHistory...
While the 6.8 SPC was hailed as the "clear and unequivocal best performing" cartridge in some terminal ballistic studies (like the 2006 Joint Service report), it faced challenges: : It delivers approximately 44% more energy than the 5
The 6.8mm SPC was born from a need identified by the during the early Global War on Terrorism. 6.8 / 10 WarHistory...
Below is a guide to the development and history of the 6.8mm SPC, often rated for its effectiveness in mid-range combat scenarios.
: 7.0mm (.277 in), the same diameter used in the .270 Winchester.