PolyCase Ammunition's New .357 Magnum ARX

Richard Johnson
by Richard Johnson
PolyCase 357

PolyCase Ammunition announced the release of their latest round in the Interceptor Preferred Defense line of ammo: the ARX in .357 Magnum.

The traditional powerhouse load is known for its recoil and muzzle blast in addition to its near legendary status as a man stopper. PolyCase uses its ARX bullet in the new load, which is light for the caliber: 86 grains. Historically, self-defense .357 Magnum loads use bullet weights ranging from 110 grains to 158 grains. As heavier bullets tend, but not always, to generate more felt recoil, the lighter ARX bullet suggests that the load may be easier on the hand than other loads.

A light bullet can often be driven at much faster speeds than a heavier one, and PolyCase added a little mustard on this fastball. The advertised muzzle velocity is 1,650 fps. Many of the 125 grain Magnum loads are advertised around 1,450 fps. With the lighter mass and increased speed, the approximate muzzle energy is 520 ft-lbs.

Frankly, I don’t know how the increased velocity will impact the performance of the ARX bullet. If you are not already familiar, the bullet is a polymer-copper projectile that is shaped in a way that it appears to “screw” into the target. The bullets are not designed to expand or fragment, yet are designed to not over penetrate either. It is an intriguing concept, though one that I am not willing to bet my life on at this time.

Richard Johnson
Richard Johnson

An advocate of gun proliferation zones, Richard is a long time shooter, former cop and internet entrepreneur. Among the many places he calls home is http://www.gunsholstersandgear.com/.

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  • Maodeedee Maodeedee on Sep 13, 2016

    Trading Mass for Velocity in most cases is a trade-off and a losing proposition. The 125 grain 357 projectile has been used successfully in thousands of actual street shootings, so if something isn't broke why fix it? The potential success of the ARX light-for-caliber increased velocity projectile is a clever gimmick, but it's possible utility is only based on theory and the fact that it makes impressive wound channels in blocks of Jello. --whoop-de-do. Shoot some wild hogs with it and then see how it works in the REAL world.

    The projectile's shape may have some merit but wouldn't it work just as well if not better if it weighed 125 grains and was a full metal copper jacketed lead projectile? But then that's not what the ARX company is trying to sell us, is it?

  • Phil Elliott Phil Elliott on Oct 01, 2016

    Has anybody heard of real world street shootings with this Bullet?