I haven't shot my 6.8 since slapping together a couple 224V's. Just really like the caliber. Have a perfect record on hogs, deer and axis deer so far. Maybe it's just me because I like something different than the norm but it has that X factor that works well. And i do like the 18" over the 20" for accuracy shooting 90 gr Federal Fusions.
If you don't have one you should get one. If you have one you should get another.