Not necessarily. I don't think 1RM and muscle endurance are synonymous. I don't lift heavy and don't know what my 1RM max is, but I doubt it's 385. I never go heavier than 3 plates. I do most of my working sets with 225, anywhere from 20 to 30 rep sets every week. That means I can press 225 more than many guys who would leave me in the dust with their 1RM.
I'd like to know what powerlifters generally do with 225.