.17-222R

.17-222R

The .17-222R is a lesser-known yet intriguing wildcat cartridge that draws from the legacy of the classic .222 Remington case, modified to accommodate the demands of high-velocity .17-caliber shooting. The “R” suffix in this designation typically denotes a unique variant or personal adaptation, and in this case, it was detailed and explored in Handloader Issue #117. Developed by expert reloaders in pursuit of improved performance and consistency, the .17-222R distinguishes itself through subtle but intentional case design changes, making it a distinctive addition to the .17-caliber wildcat family.

While the base concept stems from the well-established .222 Remington—renowned for its accuracy and case efficiency—the .17-222R version often features modifications such as adjusted shoulder angles or neck lengths to optimize case capacity and feeding reliability. These changes, while sometimes minimal in appearance, can make a meaningful difference in load behavior, especially when dealing with the sensitive and pressure-sensitive nature of .17-caliber projectiles. The cartridge was typically loaded with bullets in the 20- to 25-grain range, with powders like IMR-4198, H322, and other fine-grain options used to drive velocities over 4,000 feet per second.

What sets the .17-222R apart from similar wildcats like the standard .17-222 is its emphasis on consistent ignition and optimal neck tension, which were discussed in the original source material. Test loads showed excellent accuracy potential in bolt-action rifles with 1:10 or 1:9 twist barrels, commonly used for stabilizing lightweight varmint bullets. The cartridge also benefits from long case life when proper annealing and conservative pressure limits are observed, a trait shared by many Ackley-inspired designs.

As with most wildcats, forming brass for the .17-222R requires careful necking-down of .222 Remington cases and a firm grasp on seating depth and shoulder positioning. While reloading experience is recommended, the cartridge is not overly difficult to produce and offers a rewarding shooting experience for those seeking a high-speed, flat-shooting option for small game or target work. The performance is reminiscent of the .17 Remington but in a slightly smaller, more efficient case, making it a favorite among reloaders who prioritize control and precision.

Though the .17-222R never reached commercial popularity, its presence in specialty publications and its ongoing use among wildcat enthusiasts underscore its enduring appeal. It remains a testament to the ingenuity of reloaders and the continued fascination with pushing the limits of small-caliber ballistics.

Source: Handloader Issue #117 – September, 1985