New Cartridge Developments and Implications for Dismounted Infantry Soldiers

[stanc]

Maybe a case scaled roughly halfway between the 5.56 and 7.62 cases with a steel tipped 6.5 projo?

Case diameter might be about halfway between those of the 5.56 and 7.62 cases, but I'd expect case length to be greater than that of the 7.62 case. That's if a heavy, high-BC bullet is used, as some here postulate. Such a 6.5mm projectile would be noticeably longer than the 7.62 M80 bullet.