I'll beat the rush and mention that numerous 6.5 Grendel shooters have reported successfully shooting deer, elk, and moose at ranges in excess of twenty kilometers due to Alexander Arms' superior design format
6.5grendel rules, 6.8spc is teh crappage
Now that's funny right there.
Float Pilot, good info; thanks.
Selling everything and staring another experiment like an AR10 size rifle.
You might try what I just did (am doing) if you like light rifles. Get a DPMS/Panther LR 260
"L" - it's the lightest weight AR10 style rifle going, IINM, with the carbon fiber handguards, coming in (supposedly) at only 7.9 lbs unloaded (though the website says 7.9 lbs in one place and 8.6 lbs in another - haven't weighed mine yet). It has an 18" bbl. It's gonna get around 325-375 fps more than 6.5 grendel, with light bullets, and 300-350 fps more than 6.5 grendel with heavy loads. So you can think of it as a heavy "light rifle" or a light "heavy rifle", with quite a bit more oomph than the 6.5 G or 6.8 rspc. You can get the "L" one in .243, .260, .308, or .338. They also have other versions, including the "standard" 20" version in all the calibers. Mine is at the 'smith as we speak, having that infernal loudener chopped off - the Miculek integral compensator (cut/crown job). Though it will now sit in the corner at the 'smith for 2 months or more before being touched, I'm sure.
http://www.dpmsinc.com/
A note on caliber for this sidebar diversion from the 6.8: The .260 rem's ballistics, when you look at them, basically amount to this: With light bullets (85-100), it's about 1/2 way between the .243 win and .25-06 rem. So it's actually superior to a .243 loaded heavy - a 100 gr bullet is going at least 100-150 fps faster than it is from a .243, AND with a better BC (though a slightly inferior SD). With medium-heavy bullets, it's like .25-06 rem or 6.5x55 swede, but with a twist rate to make the heavy bullets really perform, even up to the 160/162 gr range, which the .25-06 cannot touch.