5.7 x 28 Load Data & Reloading Guide

The 5.7 x 28mm cartridge was developed by FN Herstal in the late 1980s as a response to NATO's request for a new personal defense weapon (PDW) cartridge suited for both military and law enforcement use. It was officially introduced in 1990 alongside the FN P90 submachine gun and FN Five-seveN pistol. The design was intended to bridge the gap between traditional pistol and rifle calibers by offering enhanced range, accuracy, and armor penetration capabilities over standard pistol cartridges, while maintaining manageable recoil and compact size.

Technically, the 5.7 x 28mm features a bottlenecked case designed to propel small, lightweight bullets at high velocities. Typical bullet weights range from 23 to 40 grains, with velocities exceeding 2,000 feet per second, resulting in a flat trajectory and effective engagement at longer distances than most pistol rounds. The cartridge uses a small rifle primer, which aids in achieving its high-performance characteristics.

Ballistically, the 5.7 x 28mm offers excellent penetration potential due to its high velocity and pointed bullet designs. This makes it suitable for specialized military and law enforcement scenarios where engagement of armored targets is a consideration. However, for civilian applications, the cartridge's speed and accuracy make it popular for sporting and competition use, such as in shooting matches where quick target acquisition and accuracy over moderate ranges are valued.

For reloaders, the cartridge presents several advantages, including the ability to tailor loads for specific performance needs such as optimizing recoil for competition use or maximizing penetration for specific target profiles. The availability of various bullet designs allows for experimentation and customization, while its relatively small powder charge makes it economical to reload. Positioning it largely as a niche caliber, reloading the 5.7 x 28mm can enhance precision and cost-efficiency for shooters deeply involved in its specialized applications.