i Have been using Winchester brass for two years now and haven't any problems with the 168's.
Try H4831sc , my R700 loves 65.5grns H4831sc and the 168 hunting bergers liked about 100off lands.
MV was around 2975
MOA to 800 no problem.
If this is for hunting Deer size animals and larger, 14-16power is waaayyy more than enough.IMHO. A average size mule deer should be around 1.5 MOA at a 1000yards..clear optics like a Vortex Viper or even the some of the Nikon optics should be sufficient. smaller animals or smaller targets...