3/4 oz. on ducks, even woodies and teal? I'd count on having a good dog to retrieve. There's gonna be a lot of wounded birds, IMO.
I have been down the .410 road for doves, and seen the difference in the number of wounded birds when going from 7/8 oz. of shot to 11/16 oz.(and even to 1/2 oz.). I understand the argument that you will restrict your shots to close range, I did, too. But, I am willing to bet you will see a big difference in the number of non-dead hits between 3/4 oz. and 1 1/8 oz., on close range woodies and teal. Woodies are tenacious of life little suckers. They just don't quit.
My reasoning is this, if 1/2 oz. of lead is the absolute minimum for doves inside 25 yds., which weigh 4-6 oz., and you get a very high percentage of cripples even then, 3/4 oz. of ITX is not enough for a woodie that weighs 1 1/2 lbs., at the same distance.
JMHO, SRH