Alternative to 6.5 Grendel?

[montana]

Actually wouldn't it be more weight and muzzle blast compared to the same platform chambered in 5.56 NATO?

1] The receiver is 1\3 shorter including the magazine compared to the M-4
2] The 6X36 cartridge is based on the modified Fireball case which is more efficient with short barrels as compared top the 5.56, less powder= less muzzle blast.
3] The weight of the rifle is 4.5 lbs.