My load wasn't the heaviest(probably 1200-1250 fps with 440 gr. bullet) but, not a cream puff either. I move the gun more into the web( closer to the other fingers)of my shooting hand and locked the off thumb over my right thumb, recoil was noticeably lighter. No sore thumb this time. Even accuracy was better. I managed to hit a 8" circle 17 out of 20 times from 25 yards. This is definitely the best I've ever shot this gun. My assumption is the 500 grips are a tad big for my hands?