Righteous Defense (Taunt) Hit Mechanics?

Since I've been tanking Nalorakk (Bear Boss) in Zul'Aman a lot recently, it got me wondering. What is a boss's chance to resist my taunt? I assume that Righteous Defense follows spell hit mechanics, but I have no confirmation yet. If so that would give my taunt a 17% chance to miss and 14% after Precision (love the 2.3 buff). That's a significantly large chance, yet I haven't had a single taunt resisted in my 4 kills and 10-12 attempts. Am I just lucky, or am I wrong in assuming our taunt follows spell hit rules?

-Scotthew
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- P E R I D O C -
Level 70 Paladin
Daggerspine - US

Don't think about the possibility that you're due for a brutal cold streak.
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Scarlet Crusade - 0/46/15 - Uncrushable at 15.2k

Righteous Defense, Taunt, Growl; all those were based on spell hit.

However:
"Paladin - Righteous Defense: The chance for this ability to land successfully on its targets is now increased by hit rating."

This is also being implemented for all the other taunt mechanics in the game.

http://www.mmo-champion.com/

Have you tested it? Or do you assume this new behaviour? Change from Spell to melee Hit rating doesnt mean automatically a change for the invisible game mechanism behind taunt.
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Also, if it uses the melee hit table, then hopefully it can't be reflected
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So does anyone have the actual numbers. How much +hit would we need to never have RD miss? With and without precision?
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http://www.wowarmory.com/character-sheet.xml?r=Demon+Soul&n=Havn