Wow...why would someone want that heavy an arrow? IMO Really not necessary unless you're going after elephant or cape buffalo or similar beast. Even the big bears don't require that much weight. I've taken a couple big bull bison using 63# draw wt., 28" draw and 420 gr arrows and had complete pass through both times. The broadhead I used on both these occasions was a 100 gr Magnus Stinger 4 blade.