I will try and answer at least one of your questions to the best of my knowledge.
I made a target out of half inch plate. unknown what kinda of steel it truly is. at 200 yards a FMJ 223 almost punches holes through it. a FMJ 7.62x54 will blow right through it all day long.
The newest targets ive made are made of 3/4 cold roll. are are 2" x 4 x 3/4 i have yet to make a hole. and are withstanding rounds from a fmj 308 rounds at less then 200 yards.
Originally Posted by Dirk
Well so long as it's not a Glock. If I wanted Tupperware, it's on aisle 7 at Walmart.