RE: The theory behind the 6.8mm Remington SPC
I believe the 2800 FPS MV given for the 6.8 may bewith a sporting-length, like 22" or even 24", barrel, NOT the short one on the military rifles. The figure of 2625 FPS sounds more realistic for the military weapons.
"Bitte, trinks du das Wasser nicht. Dahin haben die Kuhen gesheissen."