I tried looking through the rogue dps spreadsheet thread but with 51 pages got bored. If you are going to say "check the dps spreadsheet" dont take the time to post.

With 5/5 precision and 2/2 weapon expertise, what is the cap +hit for daggers and also swords(if it is not the same). I am daggers now and missing about 9% of my white damage and doing around 900dps on boss fights so I was checking to see what will get me to missing 0-0.1% of my white damage if possible.

Please tell me how to do this with daggers, and swords(again if they both cap at the same +hit, sorry for dumb question).

Assuming Precision, WEx, and no other weapon skill, the accepted value for the hit cap is 307.5

Think some more testing is needed, the accepted 307.5 will leave u missing.
Or atleast it does for me, and i'm even on 317 hitrating and still missing some swings(around 1.2%, not much testing here tough).

And the unavoidable missrate i don't know what it is, but 3000swings and no misses on blastedlandsmobs, when stacking up hit to 360 left the unavoidable miss if it excists under 0.03%

Do you have a screenshot/combatlog for your misses?

So far you are the only rogue to report he has missed with WE and weapon skill >307.
What mobs were you fighting?