According to Dr. Ashby when the No Mercy came out, they failed to increase thickness/hardness of the steel, still down in the high 40s Rockwell, which rather defeats the whole purpose of going to single-bevel, etc. -- being tough enough to bust through bone without bending or breaking and still penetrate deep enough to get the job done even on worst-scenario shoulder blade hits. Unless Zwickey has subsequently increased the blade thickness and/or hardness (as other manufacturers have done on Ashby's advice) I'd look elsewhere if you plan to use this setup on really big game like elk or moose, or even those monster whitetails you have up there. I've been buying and testing every Ashby-modified head that comes along, and at this time, for my money I'd go with the Tusker Concord as the overall best bang for your bucks, and the Abowyer Brown Bear among the super-heavyweights (not as sturdy as the ABS Ashby, which is top of the line in quality and features, but a lot cheaper). One tuned-in shooter's opinion. dave