Those plastic Speer bullets will go thru a newspaper at 25 feet! I used them in my basement and had a folded paper in the bottom of the laundry basket against the far wall.The red plastic "cases" are charged with a mag primer in .44 caliber. I expected the bullets to be caught in the paper, they were NOT! If I remeber correctly, they were going over 450 FPS from the muzzle of my Ruger SBH. I found out later that they WILL kill a cat at 15 to 20 feet! These are NOT toys, so be certain where you are shooting them is safe! After a box(50) rounds are fired a cleaning is neccessary. A bullet will get stuck in the bore from all the residue and plastic.