One thing I did notice about my aim, was that I tended to shoot slightly above the center rather consistently. Almost as if I've been conditioned to aim for the head *shifty eyes.* Then again, I highly doubt that the zombies will stay put on the 25 meter line, so maybe I'll have better aim with the real thing.
Dear Homeland Security,
I promise to use any sharp shooting skills that I might acquire solely on zombies, once the apocalypse occurs. I just got my visa, don't deport me please.