That is strange. I use 150gr BT Federal Premium's. I have shot 3 bucks this year and they all dropped in their tracks, 1 being a neck shot at 40 yards, the second @ 100 yards double lung penetration. And the 3rd one @ around 250 yards slight quartering shot away from me. The Federal Premium's are expensive, but so far it's been "1 bullet 1 kill shot for me" with this ammo.