The only big thing you need to watch out for with the 6.8 is lining up which chamber you have with your loading info. If it's cut with a spec I chamber, it will have a shorter leade and won't be able to handle as much pressure/powder as the Spec II chamber.
I've been pretty happy with the 110grn V-max for coyotes and the 120grn SST did well on the couple deer I took with mine.