Here's a good thing about alluminums for ya, my hubby shoots a really fast bow. A Martin Fury to be exact. In Idaho if you are hunting big game then you can't hunt with a mechanical broadhead. So when he had carbons and regular broadheads then the arrow would plane too much (because of the speed) and he couldn't get it under control. When he switched to the heavier arrows (2219's - total weight of his arrow with broadhead is 580 grs.) it brought down the speed of the arrow and made it managable. The arrow still flies at 270 fps so losing the speed when he switched to the alluminums was better than losing the animal because of an uncontrolable arrow.