.17 Mach IV (Accurate Loading Guide #2)

.17 Mach IV (Accurate Loading Guide #2)

The .17 Mach IV has long held a respected place in the world of precision varmint shooting. As one of the most practical and balanced wildcats, it gained traction among reloaders for its impressive velocities, low recoil, and reliable performance. Developed from the .221 Remington Fireball case, the cartridge is necked down to .17 caliber, producing a compact case that efficiently burns powder and delivers incredible speeds with lightweight bullets.

Accurate Loading Guide #2 includes data tailored for this wildcat, showcasing powders that work especially well in its small-capacity case. Accurate 1680 and AA2015 are among the preferred choices, producing excellent velocity spreads and clean-burning characteristics. When paired with bullets in the 20-25 grain range, the .17 Mach IV consistently delivers flat trajectories ideal for small-game hunting and varmint work at extended ranges.

While modern cartridges like the .17 Remington Fireball have inherited some of its legacy, the Mach IV remains a favorite among reloaders who appreciate its wildcat charm and fine-tuned performance. Its moderate pressures also help extend barrel life — an important factor when pushing bullets beyond 4,000 fps. The round's minimal recoil and efficient energy use make it suitable for extended shooting sessions with little fatigue.

Although it never saw commercial backing in the same way its factory counterparts did, the .17 Mach IV continues to shine in custom rifle builds. Accuracy with this cartridge is outstanding, especially when matched to the right twist rate — often 1:9 or 1:10 — and carefully crafted handloads. The guide provides reliable starting points, with consistent data that handloaders can confidently build from.

Today, the .17 Mach IV stands as a historical cornerstone of .17-caliber performance. For those seeking a fast, accurate, and efficient wildcat cartridge, it remains one of the most rewarding options in the reloading world — and Accurate’s data ensures it stays well-supported for those ready to experiment and explore its full potential.

Source: Wolfe Publishing