How's this for confusing? Two of the MS rec leagues I work use different sizes for 6th grade boys. One uses the 28.5 and the other uses the 30. Sometimes I get those different games on consecutive nights or maybe a few hours apart on a Saturday. Sometimes I have to check my copy of the rules to remember which ball to use for those games. Once last season, I asked my partner prior to a game and he just shrugged. It wasn't that he necessarily didn't know, he just didn't care.
At my age, anything that challenges my memory just adds to the general confusion in my so-called brain.