I don't think I need an FOC of 20%. However, I do think it is an advantage. Ever since I read Ashby's studies on extreme FOC and the increased penetration they give you, I was intrigued. I wanted to try them. It wasn't until after I made them, that Ashby came out with his "bone breaking" threshold theory of 650 grains. These by coincidence, were in that range.

So far, I've had two hits on very large game, that have convinced me that these arrows really do have significantly greater hitting power. I prefer that extra insurance if I hit a shoulder or other larger boned area of the animals I'm hunting. Not that I needed a lot of convincing. Ashby's studies are very well done.

I seldom try to invent anything. I usually study what others have done and then figure out what seems to fit best for me. Oh, if I wanted to hunt cars, I'd probably use a setup that was proven on steel barrels. Lots of people seem to like hunting them.

The extreme FOC arrows also bring other advantages. With these I find my broadheads very stable. In wind, they seem to fly as normal. With the weight on the tip, you get less deflection if they nip a twig or hit some long grasses. I tend to hunt in some pretty thick stuff, and you don't always notice a twig in the flight path. My recommendation is to try an extreme FOC arrow before knocking them.