I shot a fair sized cow elk with the same bullet but was using 90gr. of Black Mag'3 for powder. In my stainless .50 Omega the bullet passed completely through the chest cavity of the elk. I could not recover the bullet so I have no idea how much it opened up. I suspect from the hole in and the hole out it had opened a little but the exit hole was not huge. Bullet did not hit major bone. Shot was at about 90 yards with cow running left to right uphill.