The FOC is around 12 to 14% so there is a little more forward weight than normal (normal is from 0 to 12% as I understand)... However, lots of research has shown the heavier the arrow and higher FOC, the greater penetration... Here is a good article on that and the guys shooting elephants and cape buffalo with 1000 gr arrows and up to 30% FOC...

http://arrowtrademagazine.com/articl...BigBigGame.pdf

The blades begin opening on impact and fully deploy inside the animal. The exit wound is nothing short of amazing. Bows with 55 to 80 pound draw were tested and we have confirmed pass throughs all the way down to 60 (no one with a 55 has yet to shoot a deer to this point but our gel and target tests show it is more than capable of pass through)... They are also very durable... I had an axis doe duck when I shot at 30 yards and arrow hit underneath her spine... completely cut spine in half and dropped her. I found it 20 yards behind her and used again for a hog later that trip...