.219 ICL Wolverine (P.O. Ackley Data)

.219 ICL Wolverine (P.O. Ackley Data)

The .219 ICL Wolverine is part of the ICL (Increased Case Load) family of wildcat cartridges. P.O. Ackley’s data on this round reflects its status as a refined wildcat, built to improve on the performance of the .219 Zipper case (or equivalent parent cases) by increasing shoulder angle and reducing body taper to gain more powder capacity. The cartridge seeks to achieve higher velocities and flatter trajectories, particularly useful in varmint work where weight, recoil, and drop are critical considerations.

In Ackley’s considerations, the Wolverine benefits greatly from lighter bullets in the 45- to 55-grain range. With those weights, the cartridge is capable of delivering high muzzle velocities—estimates from historical wildcat data place the Wolverine at approximately **3,750 fps** with a 45-grain bullet, and around **3,450 fps** with a 55-grain bullet under optimal conditions. These performance levels position it among the faster wildcats of its era.

Reloading the .219 ICL Wolverine demands careful case preparation. Since the case is often formed or modified from Zipper or similar cases, attention to shoulder geometry, neck thickness, and concentricity is especially important. Battling case stretch and potential throat erosion is also part of the equation, particularly at the upper end of load pressure. Choosing powders with fast to moderate burn rates that deliver clean burn and reliable ignition can help manage both pressure and fouling.

The Wolverine also benefits from rifles with good barrel twist rates suitable for stabilizing the chosen bullet weights—rifles with adequate rifling and optimized chambers tend to produce better group precision. When loaded carefully, many shooters report the Wolverine delivering excellent performance for coyotes, prairie dogs, and similar varmint targets out to moderate ranges. The trade-offs often involve more frequent cleaning and more conservative load tuning compared to more commercial rounds.

Source: Wolfe Publishing & P.O. Ackley Data