Originally Posted by bushpig1998

I've heard a lot of good things about the 6x45 round. More sectional density means more damage at longer range than the 5.56. The 5.56 fired out of the stubby m4 only gives you real damage out to 150 meters! The 6MM should extend this range quite a bit. The only parts of a standard m16 or M4 that would have to change is the barrel and optics! Same goes for belt fed weapons...the case is still the 5.56 case - just added a bit more weight and girth to the bullet itself. The grendel is a good choice too...if you are going to 6.8, might as well go to 7.62 - not much different.

If we have to stick with the 5.56, why not just go to the 7.62 Tokarev - smaller round, yet still gives excellent ballisitcs out to 150Meters....with less recoil and you can use the same ammo for sidearm and main weapon!