I can only speak to what I have seen. My Dad and I shot up some 1 gallon water jugs with 380 HP ammo out of a Ruger LCP. He had some Winchester soft point that had a flat end with exposed lead, but no hollow point. It penetrated 4 jugs of water and kept going. Rupture the first one or two okay. I had some Underwood Extreme Defense which ruptured the first jug heavily and ended up in the 3rd. The Inceptor round I bought went through 4 jugs and kept going, partially ruptured the first two. The surprising part was some Hornady HP ammo. I think it was the cheaper American Gunner ammo. The bullet stopped in the 2nd jug. I figured the penetration with that ammo would be pretty poor.I thought the ARX bullets were claimed to be less likely to penetrate dry wall or bounce around and cause collateral damage. It seems like the ARX mfg has stopped making this claim. Does anyone else remember this claim? Or am I remembering incorrectly?
So in my experience the Inceptor ammo penetrated very well in water jugs. I might have to think about testing with pieces of wood or other solid object in front.