I read this article in rifle shooter magazine. The army was looking for a caliber bigger than a .223 to use. So remington joined the chase to find a caliber than was bigger in caliber than a .223 and that would fit and funtction in an M16 magazines. They cam up with a .30 caliber Remington case necked down for a special 115 grain .277 inch bullets. They came up with a 6.8mm SPC. They started loading it in hunting rifles and it's supposed to be enough medicine for deer up to 250 yards.Also they tested it for Caribou. It was an 11 pound rifle with the scope and it had only 5.4 pounds of recoil!!!

Just thought i would share this bit of info with ya