The .280 Ackley Improved cartridge is a popular choice for hunting medium to large-sized game due to its ballistic performance. It is based on the .280 Remington, with modifications to the case resulting in a steeper shoulder angle and a longer neck. This alteration allows for greater powder capacity and, consequently, increased velocity and energy compared to its parent cartridge. This makes it suitable for taking game such as deer, elk, and moose at longer ranges.
The enhanced ballistics translate to a flatter trajectory and greater downrange energy retention, contributing to increased accuracy and effectiveness in the field. Developed in the mid-20th century by P.O. Ackley, this wildcat cartridge gained popularity among hunters seeking superior performance beyond standard factory offerings. The increased performance comes with a slight increase in recoil, but is generally considered manageable for most shooters.