This was fired from my friend's .270 when he killed a black bear last week. It definitely was effective as the animal only took 1 step and then 'fell over like a tree' as he put it. Before the hunt he had asked me for suggestions for ammunition. I recommended something loaded with heavy, bonded bullets. These Sako Hammerheads fit that description. However I'm not impressed with how the bullet held together (or failed to, rather). It retained 30.8% of its weight. In the close up picture I was trying to show how it basically lost its core, with a small amount of lead still bound to the jacket. At the end of the day, it did result in a clean kill, but I don't believe I would recommend these on heavier game such as elk or moose.