Bill, speaking of fast pellets going through things. I did an experiment with water filled dog food cans. Using my .177 Crosman Phantom springer, it would put the .177 pellet through the can and make a water spout but not knock over the can because the 7.4g pellet was fast and lite. Using a heavier .177 10.2g pellet, it would also knock over the can. Using my .22 Discovery with 14.3g pellets, it makes the water spout and knocks over the can every time. The exit holes are also large. Both guns shoot lead pellets in the 800-850 fps range. So the extra pellet weight really makes for improved knock-down power.