I wonder - could you line the high-speed part of the tube with half an inch of soft wax or something similar? Then any dents or imperfections caused by bullets

I wonder - could you line the high-speed part of the tube with half an inch of soft wax or something similar? Then any dents or imperfections caused by bullets would rapidly be smoothed out again, and the damage to the skis would be minimized by vaporizing the wax you hit.