I shoot a Fabarms semi auto shotgun with a Comp-N-Choke. I don't like to shoot over 30 yards but it will kill to 40. I shoot the Winchester Premium High Velocity shells. Since it liked to eat them I bought several boxes. They work for me and I have killed a few birds with them. I don't like the heavy shot stuff, chipped one tooth and cracked another using heavy shot on waterfowl. Lead is maleable and doesn't hurt so much. Be careful using the TSS. If it's in your bird you might damage a tooth too.