Calamitous 
i guess i used mine as recreation before scrapping. when they are empty ( i double check each one now... ) i simply set them on a row of posts i used a drill bit on to recess for threads to fit into to hold them straight. the next step is to take a walk... about 150-200 feet should be good i normally pace it off and call it good. after your walk you take rifle or firearm of choice and add a hole through them at will. i strongly advise no pistols as accuracy becomes an issue and people get tempted to get closer if they miss.
just watch your backstop as even a .22 short still has enough power to punch through a car door 100-150 yards further down range after a direct hit on the tanks.
my preffered round is .22 & .22 short due to cost and lay of land so is experiance talking when i mention distances and power to make a hole. i have found a few extra holes in a junk car i put infront of the hill i use for a backstop.
also the distance listed is minimum. if they are not empty you just invented either a rocket or frag grenade. never had one frag on me after hundreds of them but have had a few of them rocket. i accedently grabbed a full one and after it took off i never did find it again.
the frag grenade part was a warning given to me by a old gentleman many years wiser. i am inclined to believe it as he wasnt one to waste words and pull legs.
so again... use a bit of common sense doing it if you do try this method. it isnt for every one but allows me to enjoy more than one hobby at once.
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