Personally I have had exceptional performance from the 85 grain Sierra BTHP Gameking. That is the bullet I would center my loading around in a 6mm WOA.
+1... one of the better choices... a surefire, do it all bullet...
they will ricochet off of ice or frozen ground....
i have used a couple of boxes of the 70 matchking and had no problems with them... i used them mostly on red fox and crows...
my choice of 70 gr bullets in recent years has been the ballistic tip.... superb performance on coyotes, and everything that i've shot with it....