RE: Does Kinetic Energy = Penetration?
Yep, TFOX. It's about time. <img src=icon_smile_wink.gif border=0 align=middle>
I also agree that how much momentum you need depends on whether you hit bone or slide through flesh. I prefer to bust thru bone if I mess up instead of hoping the arrow slides around it, so that's why I like my logs for hunting. 99% of the time, I don't hit heavy bone. But there's still that 1% chance lurking around out there that I know would sneak up and bite me in the arse if I used something lighter.
I could use a 400 grain arrow and still get the same amount of momentum as I get with my 2315's @ 220 fps but I'd have to jack that 400 grainer up to around 340 fps for some 103 ft lbs of energy to do it. I don't think I could get quite that much out of my round wheeled 60 pound bow. Not even at my gorilla draw length. <img src=icon_smile_big.gif border=0 align=middle>