Mr.Gadget
Old Mossy Horns
I guess I kinda see the appeal of a .300 AAC since I'm an AR owner, but I've never really considered owning one myself. With supersonic rounds its beaten by the 7.62x39mm and the old .30-30 Winchester, and the only advantage over any other subsonic round I see it having is the ease of converting a standard AR to .300 AAC.
read up more on it.
Most the rounds sold are supersonic.
Having had both the 300 blackout is far better abd more useful.