Hello, I just got a box of Independence 40 cal that says the same thing. I just got my 23c and I don't want to damage it or to put myself at risk. I got two boxes of this stuff. With ammo in such short supply now, what if that's all you can find? ? I've had my gun for about a month now, and I've shot about 250 rounds through it. I'm not sure if the ammo I've used had that warning or not.