I bought two boxes of Double Tap 40 S&W 155gr GD that are susposed to go 1275 fps, which if true would be 75 fps over factory. I shot a factory round through 4 layers of denim and water jugs. It performed OK, but I was not impressed. I then shot one of the DT rounds and it expanded less than the factory. I also noticed the unexpanded shank looked longer on the DT bullets. I went down to my scale and the factory slug weighs 154.8 gr and the DT slug weighs 165.2 gr. They loaded 165 gr GD's and labeled them 155gr. I do not yet know if both boxes are that way, or even if the right powder charge was used for a 165gr Bullet. I am going to complain, but I will have to shoot a round out of the other box to see what it is. This is rediculous.