A few years ago a group of friends and myself were eating at Chelinos when a guy picked up his jacket to leave and dumped his pocket gun on the tile floor. The place was packed and the gun bounced around the room off table and chair legs like a pinball machine. Everyone went silent as they...
Don't lay the tarp on the ground. Place it upright on a couple posts next to where you shoot so as the cases come out of the gun they hit the tart and fall straight down. Fold the bottom foot or so of the tarp to act as a catch basin.