Now that we are in MoP prepatch, the requirements should now be:
Melee hit needs 7.5% (down from the previous 8%)
Spell hit needs 15% (down from the previous 17%)
However, after reforging to 7.58% hit, I am getting misses on the raid target dummy on warrior spells: Overpower, Opportunity Strikes, and Slam.
It might be more spells and on more melee, but that’s all I’ve tested so far.
Edit: Actually a guildy pointed out that it’s probably because training dummies are now 93 instead of 88