Anyone ever filed a grade grievance for a college course?

I hear you saying a C is lower than what you typically get, but is it lower than what you deserve? Most college professors are very transparent about how they calculate grades. When you calculate your grade yourself, what do you end up with?

If there is a significant difference, I'd bring that to the professor's attention, indicating the formula you used and the scores you plugged in. Ask about why there is a difference, but be polite. If you don't get anything back, then take it one step up the ladder.