Some years ago, I did a simple experiment with my .177 Crosman Phantom. Using dog food cans filled with water at 20 yards, I shot Crosman Destroyers and Pointed pellets, in the 7g+ weight and 10g+ Beeman Kodiaks at the cans. The lighter 7g+ pellets made a water spout and went right through the cans, but did not knock the cans over. The heavier 10g+ pellets went through the cans, made the water spout, made much larger exit holes, and also blew the cans off of the log. In other words, even though the .177 Phantom probably shot the 10g+ pellets at a slightly slower fps than the lighter 7g+ pellets, the heavier pellet hit very much harder at the same 20 yard range. Continuing on with my .22 Disco using 14.3g Benjamin HPs, the cans get blown away every time, as expected, with yet a heavier pellet.