use to do this a few years back, 315 for 100 reps over 5 sets, would do usually 25 1st set, 20, 20, 20, 15...then go lay in locker room or outside on bench for like 15 minutes thinking i was gonna die. Gotta be really insane to push reps in squat, when you feel you are done at 12 and push on to twenty, brutal old school training.