in college my roommates and i dissected every shotshell we would find. federal gave us the most consistant pellet size. next were winchester and kent both had an array of sizes in the pellets. remington nitro had PLASTIC BB'S dont know if it was scientifically proven to shoot better or sumthin but i've never killed a duck with an airsoft gun. i shoot kents and winchesters and they work for me. i dont know what you use for a choke but after puttin in a patternmaster my kills and recovered bird count skyrocketed