will tell us how you plan on hunting them. decoying ,pass shooting? IF youa re shooting 3inch i would get some bismuth or any of that stuff and you should be fine. shot size i would go with number two's or one's or you could go no smaller then 4'. I dont know how the hevi shot comes in. If you going to decoy them and dont want to spend that kind of maney you could shoot what brand you liek and just get some bb's or bbb's. they both will do the job. just dont shoot them in the body and you will be fine. i have kiled swans with 3inch bbb's pass shooting them. have fun and good luck hope this helps you out.