This reminds me of the first test of my homemade gun powder in a length of pipe. I thought it would be safe, with a sheet of 1/2" plywood in front of the muzzle. The marble went through the plywood, through the workshop wall, through the laundry room wall, and disintegrated when it created a large divot in the cement basement wall.
This reminds me of the first test of my homemade gun powder in a length of pipe. I thought it would be safe, with a sheet of 1/2" plywood in front of the muzzle. The marble went through the plywood, through the workshop wall, through the laundry room wall, and disintegrated when it created a large divot in the cement basement wall.