It comes in .20, .22, and .243 calibers, and it kills very well. If it exits or not is dependany on where you shoot the thng, if in the chest most likly not, they typrically penetrate about 2.5" before shredding. Sometimes a shard of the jacket goes about 6" but other than that, the wound is normally 2" long. There are many different things that factor in when you shoot something, but for the most part, it does what barnes says.