...echo the sentiment with steel shot...brought down several canadian wild geese last fall flying overhead at around 20-25 yards (3.5" /12 gauge)...beyond that, the steel shot seemed only to wound what should have been humane clean harvests...duck hunting is even worse, unless one is able to approach closer than 25 yards...

...have you tried bismuth (? spelling)...is highly touted to be superior to both tungsten (brass) and lead...