Good shooting is right, I don't think I got over 450 my first match and I was top new shooter, shows how green we all were, plus I was using a match 45.
Of course it don't help to shoot 5 rounds on the wrong target or to shoot the leg out from under your target and watch it fall sideways. I would say with your start you'll move up the ranks pretty quick if you shoot often. Shooting a revolver won't hurt you much either. One of the best Master class shooters I ever saw was the retired Chief of police of Albuquerque New Mexico with a Colt SAA. First time I ever saw rapid fire done with a single action. 38 years later and I can still barely do it and I don't shoot anywhere near Master class when using a revolver. Me thinks you will.