I know that the .243 Winchester and 6 mm Remington are thought to be good pronghorn antelope rounds by most people and good deer rounds by many people (though perhaps fewer than those who approve of their use for pronghorns). I rarely hear the .240 Weatherby Magnum mentioned in this context, but it would seem to be more/better medicine for the same applications. Is there some failing of the .240 Weatherby Magnum relative to the .243 and 6 mm, other than the higher cost of commercially available ammo?