I used a piece of 1/4" cold roll for a teeter target, it stops everything from 22 short to 357 mag, oddly enough 17HMR leaves craters in it. I made a torso target out of the same stuff and I've shot 7.62X54R FMJ, 30-30 soft point, and 7mm mag soft point and they just blow right through it and I was shooting at about 200 yards.
"come on you sons of b***hs! do you want to live forever?" Sergeant Daniel Daly, USMC, Belleau Wood France June 6th 1918
"You can be as mad as a mad dog at the way things went. You could swear, curse the fates, but when it comes to the end, you have to let go" Benjamin Button