I have some steel targets for centerfire that I also shoot for 22lr. They are thicker, like 1/2 inch +. I have them hanging with a downward face angle to keep the spall going down. For safety, can steel targets be too thick (really heavy I guess) so that the target doesn't move? Is there a line where if the target has a combo of mass, angle and movement that you risk return ricochets? Especially with subsonic rounds?