I've got both 6.8's and 6.5G's. In my experience, it has been easier to get 6.8's to run reliably, and while they are basically equally impressive out to, or just beyond, about 300 yards.....the 6.5G certainly leaves the 6.8 in the dust past that because of high BC bullets. If I could only have one, it would be my 19"Lilja barreled 6.5G. YMMV.