For someone starting his own range, a piece of steel behind the target area, set up at a slant, as to drive the round down to the ground would be a perfect way to avoid any ricochet as well as avoid a build up of lead on his property.
It would allow for easier clean-up of the range and allow you to re-use the spent lead. As hard as it is getting to find resources for lead, it makes good sense. I thought about mentioning it to our local shooting club for our range, but thought after 50 years of people using the range, it would probably be a little late, as I am sure there is probably a couple tons of lead in the backstop already.
My only other problem with a piece of steel is the cost. Have you guys seen what the local scrap yard wants for steel now-a-days?