If I were you, I would get that frangible no lead ammo for use in centerfire shooting. Safer for you and the family. If you have an accidental discharge, you dont want it ricocheting all over or going up thru the floor to wherever. You might use 22 ammo with copper washed bullets-perhaps would cut down on lead exposure. If you get alot of lead contamination all over your basement, you would probably have to have it all cleaned up somehow before selling. And you don't want the lead vapors and dust or fragments all over the place. I have heard of pellet rifle basement shooting but for any permanent installation in the basement for firearms shooting, I would take better measures myself. Hope your insurance covers that in case of accident.