Those 375 grain Buffalo Bullet SSB's will take even elk. I shoot them out of my Black Diamond XR and my Knight Disc. Even though they are pure lead, they are very accurate. I suggested these to a friend that elk hunted with a Black Diamond XR like mine. They loaded 110 grains of Triple Se7en 2f and the cow they shot (a real nice one) we 25 yards, laid down and stretched out dead. They would sure work on a deer as well.