Yeah, I've compacted down to 4" of cement. Odd thing is when I first went out with my kid, we couldn't make a snowball that held its shape. After some fzdz, I sent her back inside (she was cold) and did some shoveling. With 4" OTG after some sleet and fzdz, it felt more like shoveling 7 or 8 inches.
Or maybe I'm just getting old