Using and understanding Reader Names fields in IBM Lotus Notes and Domino
Guess what I found out! If you're trying to be lazy and stick an entire group into a reader field... don't. Maybe it's just me (or my server) or whatever, but I couldn't get it to work.
Roles work much better. Give the entire group a role in your ACL, and just put the role into the readers field (surrounded by brackets and quotes, of course).