Hi fellas, just got through with a successful elk hunt with my son taking his first elk in a one shot kill. I am using the 215 Berger Hybrid "Target" from my semi custom 300 RUM at a muzzle velocity of 3,185 fps. Distance to elk~ 522 yards. Impact velocity at 1900ft altitude and 50 degrees~ 2,535fps. Kinetic energy at animal~3,069ft/lbs. Bullet entered directly behind the elk's left shoulder in a quartering away angle. The bullet struck and broke three ribs on the way in. Traveling past the rib cage it completely destroyed the heart and lungs. We found no penetration past the vitals in the offside rib cage wall. This is not really a surprise to me after seeing that the bullet hit all three ribs on entry causing it to open rather quickly decreasing overall penetration. Below are some pictures. Sorry about the resolution on a couple, these were cell phone pics in dark timber. Below is the shot placement: Below is the heart/lung group: Below is the bullet entrance damage to the rib cage. The hole is around 4" long in an oblong pattern: I am satisfied with the performance of the 215 Hyrbid in this situation. I feel that if it were a perfect broadside shot with the bullet striking one rib that I may have had a complete pass through.