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5.7X28 FN

5.7x28_fn

In 1990, Fabrique Nationale (FN) introduced the 5.7×28mm FN. This 22-caliber round was invented for use in a fully-automatic pistol-type submachinegun. Performance is very limited due to modest case capacity and barrel length. Pressure is held to about 50,000 psi, which is significantly less than is used in most modern rifle cartridges.

This round was created for specific application in a light, handy gun designed for easy use in building entry and other situations where a bigger gun could be hard to use. Launching a light bullet at moderate velocity make the gun entirely controllable in fully-automatic fire.

Original factory ammunition was intended for use in a machinegun. As such, it was deliberately loaded to have a minimum degree of what is called dispersion.

 


 

For Military applications, ammunition used in a machinegun needs to be inaccurate to a certain degree so it presents a field of fire, rather than placing shot after shot into the same spot. So, initial efforts to standardize the chambering for use in sporting arms was a dismal failure because the available ammunition was so inaccurate.

Savage tried this many years ago, even going so far as to announce the chambering in its full-sized bolt-action rifle. When it discovered I was right in warning about the deliberate inaccuracy in factory ammunition it quietly retracted the claim and hoped it would soon be forgotten (my apologies for not allowing that to happen!).

FN now offers a pistol chambered for this round and called the Five-Seven. Factory ammunition is now made with accuracy in mind for this application. One must question the utility of such a combination as a fight stopper.

Because of the modern case design, this round would make a fine substitute for the Hornet. With well-assembled handloads using the best components, it should be a perfectly fine minimalist chambering for both handgun and rifle varminting.


The text associated with the cartridge description reflects opinions and conclusions of the author, M.L. (Mic) McPherson. Lee Precision and its employees do not necessarily either agree or disagree with any of his comments. We present these with due deference to his recognized expertise in the firearms field. His acumen extends to handloading and all aspects of ballistics - internal, external, and terminal.
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