New Army "Caliber Configuration Study"

[SHORT-N-SASSY]

6.5x43 GPC prototype, second from left, below.



Article: http://www.thinkdefence.co.uk/2013/11/us...-calibres/

"...the US discovered that various potential enemies have been quietly enhancing their own small arms capabilities and are on the verge of achieving overmatch.

There has been no specific information on what the evolved threat is, but it appears that the Chinese and Russians are about to field improved ranges of weapons and ammunition."

Maybe there really is a 6.5 Grendelski???

What are the respective exterior case dimensions and case capacities of the 6.5x43mm GPC prototype and 6.5x45mm wildcat cartridges, along with their comparitive muzzle velocities, from a 16" barrel?