No matter what caliber, bullet type, weight, or speed, its nothing without accuracy! For your personal gun, you will just have to experiment with different types of bullets and different brands too! Even with the same bullet type and weight, individual guns will shoot to a different point of impact with different brands of ammo!
For the most part, premium brands will give more consistant groups, but I have a .308 that prefers plain old Remington Core-locts, to any of the expensive flavors that I've tried to feed it!
Wether premium or plain Janes, once you find a match for your gun, it will probably be capable of more accuracy at longer ranges, than you or I are! Good luck!