Hey Wolfey,
Most manufaturers set their acoustics up stock with .012-.053. There are however, subtle tension differences between different companies, etc. Also, if you switch from a Phospher Bronze to a Bright Bronze, you will note a tonal difference. Tempearture can also wack things out a bit. You can do a simple truss rod tenstion check by doing the following:
(While Tuned to standard tuning)
Holding the guitar, place your first (index) finger of your left hand on the first string (Smallest string), first fret.
Place your index finger of your right hand on the first string, on the fret right where the neck joins the body (Not the one before the body, the first fret that is actually on top of the body). (Usually the 15th fret)
Keeping your left index finger in place, gently tap the string up and down with the pinky on your left hand.
There should be a very very very small amount of play. It the string is lying flat along the frets, then the truss is too tight for the tension of the string. Try backing it off about 1/4 turn and repeat. I would check all strings this way prior to any adjustment. Also remember, righty, tighty...lefty loosey.
P.S. Do you hang the guitar from its neck on a wall hanger by chance?
Fangar