Waterfowl...
Antique Shooter--I hunted ducks & geese back in the lead-shot days. Geese especially, need to be hit hard to reliably bring 'em down, and lead, being relatively heavy, retains more of its inertia for longer, resulting in greater impact on the goose (provided of course that you do your part in shooting well!)
Steel, being relatively lighter, slows down quicker--that is, it loses inertia faster, therefore hits the goose less hard.
For this reason, I favor hevi-shot or similar over steel. It has the same (or even greater) heft as lead, thus giving me back that hard hit to knock down the big Canadas.
I know that hevi-shot is more expensive than steel. How much $$ do you waste on a new duck boat, new waders, a new Labrador, etc, etc, compared to how much $$ you put into this years' ammo--and then you lose geese because of cheaping up on the ammo?? Not me!!
BTW, it helps to get to the trap range and do some practicing pre-season--and you can use cheap trap loads for that.