[Travis McGee]

The 6.8SPC is about as powerfull as the 762x39 or 30/30 win-with a trajectory of a rainbow past 300m-so we are back to the same result (if it was a super round, the High power community would use it-not a one will touch it as it is a turd in a punchbowl long range performance wise toooslow and too light bullet balisitally speaking).

I think you're off the mark comparing the ballistics and trajectory of the 6.8Rem to 7.62X39 or 30-30. And no, it's not going to light up the high power world, but no round that packs 25 cartridges into an M-16 magazine ever could do that.

[Manly Warrior]

Okay, the 30/30 pushes a 150 grain .308 diameter bullet at 2300 f/s froma 20 inch barrel, the 762X39 makes a 123 grain .308-.311 diameter bullet at about 2400 f/s from an 18inch SKS/AK barrel.

The 6.8 pushes a 115 grain .277 diameter bullet at about 2550f/s from a 14 inch M4 barrel.

Add 6 inches to the 6.8 and you see advantages, but the 762x51 is already a mil-spec round with several off the shelf platforms available and in the field.

Calculations indicate not too much difference in KE at the muzzle (30/30 leading), plus the 115 grn .277 bullet has a rather poor BC (about the same as the 123 762, slightly better than the 150 grn 30/30 -because the 30/30 uses a FP bullet) and therefore a short range trajectory.

Correct me if I am wrong.

[Old Dirty Bastiat]

6.5 Grendel does. Getting reliable 25 round magazines requires trial and error though.