I take it you don't have mallards.

Wounding rates around thew world escalated with the banning of lead shot. The cheaper steel shot is very bad for wounding as people try to take shots quite doable with the lead of the past.

At least bismuth is 1/2 decent, but expensive. Heavy shot, tungsten is even better than lead, but likely not usable in old SxS or O/U shotguns, just like steel(IRON).

I sold my O/U and SxS migratory bird guns when lead was banned here.