As a matter of adding a few points of data, my dad had, for many years, what had previously been a 125 gallon propane tank which the top had been cut off and was used as a burn barrel.
We shot it a good many times from his back porch, a distance of about 100 yards. After many years of withstanding all sorts of heat and weather, we never shot it with any bullet from any gun that would penetrate the tank. 22, 30-06, 12ga and 20ga slugs, 45-70, .204Ruger and probably quite a few that I forget. None ever penetrated. It was a matter of how big was the dent.
Still happily answering to the call-sign Peetza.
The problem, as you so eloquently put it, is choice.
He is no fool who gives what he can not keep to gain what he can not lose.
-Jim Eliott, paraphrasing Philip Henry.