For a general CR-FFL forum, the mail list that troynm referred to is the ultimate. Pick the digest version unless you have a LOT of free time on your hands...I'd eyeball message load at about 100 or so per day, sometimes a lot more.
If you want somethig more specific, there's a web page/mail list/forum for just about any CR gun you could think of. A search on google can fill in the blanks for you, or shoot me a msg.
-hanko