The 228 Ackley Improved Magnum is a wildcat cartridge derived from existing cartridges, redesigned by noted gunsmith and cartridge developer P.O. Ackley. The "Improved" aspect generally indicates a steeper shoulder angle and less body taper, which can result in higher powder capacity and, therefore, potentially higher velocity and improved performance. This cartridge is part of Ackley's series of wildcats aimed at optimizing performance characteristics like velocity, accuracy, and ballistic efficiency.
Use cases for the 228 Ackley Improved Magnum would primarily involve hunting and long-range shooting, where such enhanced ballistic properties are advantageous. It is suitable for medium to large game due to its potent performance but is less common and not commercially produced, often requiring custom rifles and handloading.
Not enough information on specific ballistics or comparisons to other similar cartridges.