Thanks for the replies guys. It really was a great time.
I did pick up a couple boxes of #8 shot to keep in the range bag. If I can find some reasonable 7.5 I will grab a box or two of them also. I'm sure it was dumb luck, but I was able to break a couple 40+ yard birds using IC and 9 shot. I just wasn't able to do it more than once.
Jim - What kind of press do you use for the .410? I end up with shot bridging when I use anything other than 9 shot. It drives me nuts as I have a few hundred pounds of 8.5 shot here that I use for 12 and 20.