I just bought some for the 38 spl a month ago and loaded 18 rounds and did notice a little problem getting the primers in and slight damage to one base............ Its plastic !!
Courious if they will penetrat a cardboard box at ten feet.....
I intend to have a blanket backstop to catch the bullets and have them drop to a collection box. Got them for the wife and daughter-inlaw to practice with. Have not tried one yet,since I don't want to scare the stuffings out of the dogs.
Was surprised by the 300 primers though..........oh well.
Was thinking a large CB box with the flaps folded in at a 45 degree would catch the bullets and a paper target could be taped to the opening................ maybe a paper plate,still in the early planning stages.
good luck.
ps i almost passed on this message .... might add: Plastic practice load