Thread: .270 is the best caliber ever made.

But if it's the 6.8 sig I'm thinking about they are running at 75k plus psi (with a 2 piece case), to get a normal performance for a 270 from an AR platform with a short barrel. Not quite the same.
6.8 westerner I a bit more like the modern take on cartridges.
Shorter fatter unrelated case (just different enought to not get mixed with 270wsm), with a fast twist barrel to get heavier, more BC efficient projectiles that work better at longer distances.
Ala 6.5creed vs 260 and 6.5x55.
If you don't shoot that far out it's a moot point