I tried the 400 "FatBoys" for 3-D and ended up going to the 500s as the 400s were spined to stiff for my setup! The only way the 400s would paper tune is if I cranked my bow up to 70lbs.
The 27inch 500s shoot great at 63lbs and weigh 315 grains with an 80 grain glue in point.Most of the guys I know that are shooting the "FatBoys" are now shooting the 500s.
As stated above......these are target arrows and NOT hunting arrows!!!!!