I love RST shells! That being said, I tried the 10's on woodcock, in a 28ga, and did not like them. I knocked down 2 birds that got up and flew again. Had to shoot one again, never did catch up with the other one. Then I had one fairly close crossing shot at a doodle, and that load of 10's did pretty nasty things to it.

I don't have anything against 9's on woodcock, especially if you're shooting a light load--like 3/4 oz--through an open choke. But that's as small as I want to go.