The default mode of device nodes created by udev appears to be 0660 since udev 051, not 0600 like the comments in 50-udev.rules shipped in FC4 and later says. I reported this upstream and sent the attached patch there, but I'm reporting it here as well because the FC package is using a "private" 50-udev.rules, not the upstream redhat/udev.rules one. Additionally, if the default really is 0660 nowadays, the shipped 50-udev.rules could be cleaned up quite a bit.
Created attachment 116715 [details] For reference: upstreamed fix for default mode docs
put mode back to 0600 to keep secure settings.