I presume you are speaking of cast bullets -- the WFN needs to travel fast enough for the twist rate to stabilize it, so it's accuracy needs a minimum velocity to achieve a stable rotation. WFN cast in my experience seem to impart more trauma to an animal than smaller nose profiles. Generally a WFN needs to be seated deeper (shorter OAL) for a given weight to be able to reliably chamber from the magazine, which reduces powder capacity and top velocity. I am not looking for top velocity when loading WFN, my reason for choosing a WFN is performance once it impacts. To get back to your question -- all bullets have a minimum and maximum velocity for accuracy and performance. I have usually been able to get a WFN to accurately shoot and feed from magazine in several different calibers and cartridges with minimal effort.