I have had teachers try to grade on a strict bell curve distribution, but if your goal as a school is to accept promising talent then train them better you should expect your students to fall within a part of a bell curve and not spread across the whole damn thing.
Sorry, can't pass you cause my morals oblige me to give 2 As, and 2Fs, and I'm all out of everything but FS (no matter how many points you were away from someone with a better final grade).
