Hit/miss rating and Low level characters vs high level mobs.

Quick - possibly dumb - question about how hit rating scales with mob level.

EG. My tankadin is level 49, with the draenei bonus 1% to hit.
So to hit a mob of level:
49 = 4% miss chance
50 = 4.5% miss
51 = 5% miss
52/Boss (as it appears on the tooltip) = 7%

But what about mobs 53 or higher? Does it just keep scaling linearly?
And does the same thing happen for expertise?

Yep, by 2% per level. Unless they've changed it (unlikely, but I haven't seen a test of level+4 or higher recently), the miss formula is

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5%+0.5%*(npc_level-player_level)   if (npc_level-player_level)<=2
2%+2.0%*(npc_level-player_level)   if (npc_level-player_level)>=3

so it should progress like

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level+    miss     dodge    parry
0         5.0%     5.0%     5.0%
1         5.5%     5.5%     5.5%
2         6.0%     6.0%     6.0%
3(boss)   8.0%     6.5%    14.0%
4        10.0%      ?        ?
5        12.0%      ?        ?

And so on.

I'm actually not sure about expertise. Dodge is probably 5%+0.5%*(npc_level-player_level), since that's consistent with what we know for level to level+3, but it's possible that the distribution changes at level+3 in such a way that it maintains 6.5% (x1+x2*3=0.065, one free parameter). We know that parry has the same formula up to level+2, but jumps at level+3. This could just be a flat 7.5% added base parry (i.e. parry=12.5%+0.5%*(npc_level-player_level), or it could be a change in scaling (again, x1+x2*3=0.14, one free parameter). A quick google search didn't turn up a reliable source, so without testing it I'm not sure what the answer is.

Hmmm. Untested area.

I might just go smack a few mobs and get some dirty numbers using recount.