My son shot a big buck (200lbs+) at about 125 yards or so with a .257 115BT out of a 257 Roberts. The deer ran 80 or 100yds in a big circle.......He placed the shot in the ribs right behind the shoulder.........The lungs were soup.....Literally. All we found of that bullet were a few tiny fragments.......These were bought as seconds from SPS about 4 or 5 years ago.......These bullets are very accurate and did what it was supposed to do except stay together........