I've hunted with a 100gr 4 blade muzzy for years with great success. Now that they've come out with the MX4 I'm thinking on trying them. I've read the specs on them but does anyone know the outside diameter of the ferrule. They say they are HIT compatable but I don't know if that means they are the same diameter. The only reason I never went to HIT arrows is because the original 4 blade muzzys are so much wide than HIT shafts like the AXIS.