I had good luck with them ...even when it didn't work just right.....shot a little deer quartering away stiffly and the arrow went up the side of the deer outside of the rib cage and cut a 6 inch section of backstrap out...left a 8 or 9 inch hole in the deer but never went in the ribs......deer dies 30 seconds later but I got lucky...I love the NEW NAP Helrazer.........awesome kills this year with it and it flies like a field point