Sure, when you get down to the nitty-gritty of wildcat cartridges, there is usually some advantage, however minute. Making space for extra propellant can be achieved by reducing case taper (and usually shortening the neck with sharper shoulders), such as observed in the .250 Savage Ackley Imp., .257 Roberts Ackley Imp., 7x57mm Ackley Imp., .280 Ackley Imp., 30-06 Ackley Imp., .35-06 JDJ and many others. ThreeCertain wildcat cartridges are immensely versatile—especially those with the “Ackley Improved” treatment. The BadOneAnything custom is expensive, and true wildcat cartridges no different. So it goes with unusual wildcat cartridges.