Doctrine and why the Grendel has an uphill battle.

[stanc]

On a scale of 1 to 10, how would you compare the .223/5.56x45mm against the 6.5mm Grendel, as we know it, in the cartridge selection matrix?

In order to answer that question, it would first be necessary to know how the "cartridge selection matrix" is defined.

In regards to combat endurance, if 7.62 NATO is a 1, and 5.56 NATO is a 10, I would rank 6.5 Grendel at a 4.5.

Ammo loads of roughly equal weight: 5 x 7.62 mags = 100 rds; 7 x 5.56 mags = 210 rds; 6 x 6.5 mags = 150 rds.