They should absolutely apply to a large, balanced school list that includes md and do schools. Should you retake an mcat score of 503? Is 503 a good mcat score? Is 503 a bad mcat score? The answer depends on several factors including what type. Webbut 503 is the average for a lot of do schools and well within range for most do schools. Webaug 19, 2017 · a 503 is roughly the equivalent of a 26. Input your gpa range and voilà, instant stats. These numbers don't capture the whole picture though. It is possible to.