There's the difference Wildcat. They work way better when driven hard. In my Weatherby's that I have owned 240, 270, 7mm, 300, 340, they have performed as desired. I don't use them any more because of the copper fouling & I believe I have found a better allround, all game bullet that always opens & never fails. That bullet is the magnificent North Fork SS. I use 180gr in my 300 Weatherby, 250gr in my 9.3x62, 270gr in my 375 H&H & 375 Ruger & 300gr in my 375 Dakota. I also have 250gr & 350gr North Forks in 375 but I have not yet tried them.