.17 Ackley Hornet (Cartridges of the World)

.17 Ackley Hornet (As Referenced in Cartridges of the World): A Benchmark Wildcat

The .17 Ackley Hornet stands as a benchmark among early wildcat cartridges — a prime example of P.O. Ackley’s vision for improving performance without radically departing from classic cartridge architecture. Based on the .22 Hornet case, this version was reimagined by Ackley with a sharper shoulder and minimal case taper, then necked down to accept .17-caliber bullets. The result: a cartridge capable of pushing lightweight projectiles at remarkable speeds, all while keeping recoil and noise exceptionally low.

Often cited in reference works like Cartridges of the World, the .17 Ackley Hornet is described as both historically significant and practically effective. It filled a gap between rimfire precision and larger centerfire punch, offering reloaders a flat-shooting round ideal for vermin, pest control, and precision small-game hunting. With velocities in the range of 3,500 to 3,700 fps for 20-grain bullets, its performance remains impressive even decades after its development.

Part of the cartridge's appeal is its economy. It uses relatively small powder charges and easily formed brass — often converted from standard .22 Hornet cases. Its modest blast and barrel-friendly characteristics make it suitable for high-volume shooting or applications in more noise-sensitive environments. While factory ammunition has never been widely available, the cartridge’s popularity among custom builders and reloading enthusiasts has kept it alive in the hands of those who appreciate its finesse.

Modern bullet technology — whether from Berger, Nosler, or Hornady — has further enhanced the Hornet’s performance, offering better ballistic coefficients and terminal results than were available during Ackley’s time. Yet the cartridge’s core charm lies in its vintage origins and clever design. It remains a testament to Ackley’s ingenuity, earning it a permanent chapter in any serious discussion of wildcat cartridges.

Source: Wolfe Publishing