No way on springs.
Part of shooting steel is the correct angle of deflection for the round. If there is a spring involved then the angle becomes variable, not good for ricochets. I personally have been hit by shrapnel from a swinging target, you can't imagine what a paper thin piece of copper jacket the size of a pencil eraser feels like when it thumps you in the ribs. Broke the skin as well....
So you need a sturdy base, and/or a sturdy rack to hang the targets from with chains. Only shoot the targets, I know that sounds obvious, but the sound of your post makes me think you were hitting other things.
Unless you have the equipment to make the targets properly from steel, you are better off buying them. Make sure you get the correctly sized targets for the calibers you are shooting.
Last edited by shoot summ; 07-04-2017 at 10:45 AM.