Well obviously with the extra blade that arrow is gunna fly different due to the extra blade effecting the aerodynamics and flight of the arrow. Also is the grain different then your field tips? But im not a fan of any broadhead over 3 blades cause i personally think that at four you are just causing too much surface area touching the animal therefore more drag and friction and not as good of a cut or penitration as a 3 or 2 blade.