1. I used to do the same with blanks when I lived in the middle of the middle of nowhere in Suffolk. Fun targets (as were aerosols placed next to candles, or aerosols with .22” blanks taped to them). If I tried that now in London it would be about five minutes or less before CO19 turned up pointing multiple G36Ks at my head. And the sniper in the helicopter.
2. 120 yards? Sigh. I wish.