Tactical Life posts that the military is changing to the 6.8 in SAW and M4

[distopianpotluck]

It's all real. Some of the earlier attempts at hybrid metallic/polymer cases were abject failures resulting in case head separations, side wall fractures, dislodged projectiles, and blown primers.

There are at least 3 different approaches going on with 6.8 NGSW as mentioned in the down-select.

The new True Velocity cartridge configuration basically fits the form factor of 7.62 NATO, with with substantially reduced weight and substantially-increased working pressure pushing a .277" EPR. The bullets they're showing may or may not be the specified projectile that the Army "nailed down". The Army has changed the projectile weight and shape at least 3 times already.

Pretty neat stuff. Hopefully since the guns were designed to handle this type of ammunition they will function just fine.