I used this bullet (.270 130 SST) a couple of years back on a cow elk. Out of a .270 Ackley at about 150 yards, the first bullet blew up in the shoulder. The second blew up high in the chest. The next year, I shot a whitetail buck facing me at about 400 yards - bullet went back into the flank, but there was nothing left but the jacket. They don't seem to be as tough as the regular Interlock. Tried the new Interbond this fall, but can't get them to group any better than 3". Roscoe