I've only ever really used Exacts but I have noticed big variation in long-range grouping, particularly past 45 yards.
Sometimes it's very difficult to see any difference in the appearance or quality of the pellets that might account for the variation. The best grouping batch of Exacts I ever had were very poor on the scales and looked like they'd been swept off the floor. In my experience shorter Exacts seem to perform better than longer batches.
You just have to test them. It partly depends on the rifle, the fussiness of my Walther LG300 was one of the main reasons I bought a new gun, though I've no real idea whether this new Steyr will be any less sensitive as I've been on the same batch since day one.