Seen and read a lot of info on the web about the ARX, so bought some in .380, 9mm +P both the 80 and 65 grain, and the .45 ACP. They penetrate 4 layers denim like it didn't exist, yet stop at around 14". I've also shot Winchester Ranger T .45 RA45T that Olin took back because they failed to expand and many only partially expanded. One was pretty much a FJM. Clothing can cause real issues with hollow point, as that "Hollow" is necessary for proper fluid pressure to disrupt the bullet. There is no "hollow" on the end of ARX. Getting a Winchester Talon to properly open up all the time would be very nice. However, if it doesn't open up, as sometimes worn tooling doesn't "score" the inside properly, then you have a tumbling piece of copper/lead bullet. Tumble is not bad, but it's not what the Ranter T was designed to do.
One other feature about Ruger ARX bullets that I've personally noticed is reduced recoil. I have no issues with recoil, even in my age, but my wife "barely" will shoot the .380 Bersa due to her arthritis and other pain ailments. With the ARX, it gives her a FJM that can penetrate heavy cloth, and deliver a temporary wound cavity, and shoots about like a .22 LR. For others, it is a lighter loading of magazines, and quicker follow up shots.
Just saying. And, no I don't work for PolyShield nor get any free stuff from them, just intrigued by modern engineering and an Army Ranger's desire to improve the field of ammunition.