[Doc91678]

They've experimented with the 6.8x43mm SPC using the M-4 configuration. A 85gr-90gr bullet will reach out to about 900 meters. That would be using a 20 inch barrel length. I think that going to this bullet size and weight might do the trick in a Bull-Pup configuration. the 6.8 mm round is equivalent to the 270 a flat shooting round. The Bull-Pup configuration would allow the use of a 24inch barrel and keep the weapon short. But who am I to make suggestions?

[NorthMountain]

the 6.8 mm round is equivalent to the 270 a flat shooting round.

Interesting. Back in the 1930s, when what would eventually become the "US Rifle Caliber .30 M1" was being developed and tested, they played around with a .276 cartridge. It was ditched in favor of .30 cal due to huge stocks of ammo left over from The Great War.