ElkKampMaster gave you rock solid advise. I think you answered your own question, when you said you had 4-boxes & they shot well in your rifle? I would stick with the FailSafe' s.
If you want to try another brand of factory ammunition, just to see how they shoot??? I would look at the Federal Premium ammunition. Just stick with a premium bullet, Fail Safe' s, Barnes-X, Partition' s & TBBC' s all make the list.
Just as a side note I tried failsafe' s, Barnes-X & Nosler Partitions. My rifle shot the Nosler Partition the best so that is what I shoot.

Good Luck,