This cartridge was designed by the military and it's purpose was to give the M16 platform more stopping power than the 5.56 Nato. From what I gather, it's a simple conversion into a M16 and it's variants, has comparable ballistics and lethalityto the 308 Win/7.62 Nato with good accuracy. Only time will tell if it will be accepted by the US armed forces, I am sure it has alot of red tape to get through.

When you look at the 308 Win and the 45ACP they dont offer stellar performance but are accepted by most.