I cast and use the 50 cal 320 grain REAL bullets. I have shot three deer with them, #1-neck shot at 25 yds. flipped the deer over backwards bullet passed through. #2- 50 yd broadside heart/lung broke ribs on both sides, passed through, he ran 75yds before running out of gas. #3- quartering away at 40 yds. ribs, lungs, smashed opposite shoulder before exiting out through the top of the shoulder. I am happy with them so far.