You can shoot them safely, but your simply wasting money. With out the stabilization of spinning they tumble end over end. Ofcourse this plays havoc with accuracy.

A few years ago we played around with shooting Remington Solid Coppers out of my IC deer barrel. We shot them at an old car. I will say they made interesting holes going through and coming out the car doors. I always figured they would make an excellent home defense round used this way.