As a kid growing up my dad bought just about ever caliber of gun at some point from the 220 swift up to the 308 and 30-06. We would always sight in the guns at 3/4" piece of steel at 100 yards. The most amazing thing happened when you fired that 220 at the steel. If went completly thru it (and was the only one that would go thru) Not only that but the metal was peeled back on both the frount and back of the plate as if the bullet came out both the back and frount of the metal. It is an amazing little round..