We've covered PolyCase's innovative copper-and-polymer bullet ammunition before; it's a proprietary mixture of copper and polymer that yields a lighter bullet with less chance of overpenetration. The ARX line incorporates "lateral force dispersion" caused by the engineered shape of the projectile.
Using a proprietary blend of copper and polymer, the PolyCase 380 ACP also has the company's custom bullet design.
PolyCase now offers the ARX in .380 ACP, recognizing the smaller round can benefit from the lighter bullet weight in the form of increased velocity. Claimed velocities from the 56-grain bullet approach those of standard 9 mm, with more than 1,150 fps achieved.
The unique shape of the ARX bullet should feed well in most small semi-automatics, as there is no sharp point or steep ogive to catch on feed ramps. Whether the engineered shape results in greater penetration or wound cavity remains to be seen, so look to Shooting Illustrated for more information on these new projectiles.