I hate steel and refuse to shoot it in my guns though it can be effective and is relatively cheap.
I use Kent's Tungsten Matrix, just about but not quite the equal of lead at 10.6 gms/cc while lead is just over 11 IIRC. And, it's "soft" like bismuth (but denser) and can be used in finer guns without the worry of scoring a barrel. A M choke will be good and since it's about like lead, size "5" would be good for ducks. "1s" for geese.
