Most of my rifles penetrate 1/2" steel if I use FMJ's! My WWII bolt actions will penetrate 1/2" steel with soft points! The ammo and caliber should be a factor in deciding what to use as a backstop...
Guns Have Only Two Enemies-Rust and Politicians
"The United States Constitution (c) 1791 - All Rights Reserved"
If Guns Kill, Do Pencils Mis-spell Words?
Pain is Weakness Leaving the Body - USMC
"Qui desiderat pacem, praeparet bellum"