A lot of bullets that lose their cores often seem to perform perfectly in that the animal drops in its track. And, if the bullet isn't retrieved, people think that the bullet performed perfectly. This was basically Romac's experience until he found the bullet. I use corelockts for plinking/casual target shooting as well as sighting in. Once I get it right where I want it, then I go to the premium bullet to make sure that is hitting right on. I try to waste as few premium bullets as possible on paper, but never worry about the price of them when I am shooting them at an animal.