Steel
I'm no expert on shooting steel. I do though have an acquaintance that narrowly escaped death shooting steel. Shooting a 1911 at several yards the bullet, large splatter or large bullet frag of some type struck him in the eye. He lost that eye, and the surgeons told him that just a smidgen more penetration and he would have been killed. If I recall his story properly, it was a spinner being shot by a friend. He believes it was hit a second time "edgewise" while spinning, the ricochet came straight back. Personally, after knowing him and his situation, I would not shoot any steel close at all. Being hit by any splatter is too much for me.
I'm no expert on shooting steel. I do though have an acquaintance that narrowly escaped death shooting steel. Shooting a 1911 at several yards the bullet, large splatter or large bullet frag of some type struck him in the eye. He lost that eye, and the surgeons told him that just a smidgen more penetration and he would have been killed. If I recall his story properly, it was a spinner being shot by a friend. He believes it was hit a second time "edgewise" while spinning, the ricochet came straight back. Personally, after knowing him and his situation, I would not shoot any steel close at all. Being hit by any splatter is too much for me.