A couple of things will make your steel shooting safer.
1. Get AR400 or AR500 steel once they get pock marked they are unsafe.
2. Shoot lead or plated bullets at moderate to spiffy speeds no high speed or low speed rounds, no jacketed.
3. Angle the steel top forward, toward you a slight amount, around 10 degrees.
4. Wear good safety glasses not the cheap type wear heavy clothes, jeans and a jacket if weather permits.
5. Stay out of the zone notice on the ground and see where the splatter is going. You want splatter not complete bullets coming back at you.
6. Don't shoot handgun over 25yds and centerfire rifle always more than 50yrd for lead and 100yrds with jacketed rifle. You can safely shoot handguns at point blank range. Watch out with rimfire it can bounce back with quite a bit of force.
Using these tips you will avoid most stuff large pieces coming back. I have been hit many times with portions of lead or jacketed bullets and it will smart and leave a bruise. I have had pieces of jacket material go completely through my thumb so no jackets for me.
Good luck.