I tested out the 125 grain NAP Crossfires, I was very dissapointed with the durability of them. Yes they do fly like darts out of my setup, but when testing I had them bend on me, just below the cartridge where they screw into the insert and they touch the arrow shaft. Two weekends ago my hunting partner and I, when camping and scouting were shooting our arrows into soft dirt with a few small rocks. I know that it's not the best backstop but I wanted to see how the new heads could take a beating. I also had a few thunderheads and muzzys to try out and compare, which is what I havehunted within the past. WellI only shot the crossfire5 times into the dirt until it bent on me. We shot the muzzys and thunderheadsat least 30 plus timeseach into the same dirt with no major damage to the heads. The very tips did get deformed on both of them.And one of the blades on the muzzy did chip after about 20 or so shots. I'll take a pic with my digital camera of the crossfire to let everyone see what I am talking about. Yes I know I will not be shooting into rocks and dirt when elk hunting but I worry about hitting major bone and having the broadhead bend like it did on me. With the crossfire, the cartridge itself seems to be built like fort knox (sp?) but it is supported by, (i.e. spining on)a toothpick. I agree with the COC for elk but if you have enough KE then there is nothing wrong with a fixed 3 blade head.