One thing I've learned about shotgunning, is that if you connect the bird and the center of pattern at any reasonable distance - say up to 40 meters - there's precious little difference what shot size, load and choke.

#4 lead can be effective for just about anything. Lots of diehard waterfowl hunters over here use #3 lead for geeze over decoys, and swear if a goose is too far to be killed with #3 reliably, it's too far for any shot size.

And, lest I forget, congratulations with a great hunt!

Russian Hunting Shotguns