I've shot my best groups with 50 gr NBT's but I like the way the 77's kill. And of course we now can shoot to 800 yards so I'll stick with the 77's. The last 1000 I loaded were Noslers and they don't group quite as good as Sierras but they open up a little quicker.
While I like accuracy, I don't shoot targets much anymore except with the 22 LR.
