Burner, a bonafide Southerner just says "y'all". Beware of imitations Whether it's 1 or 50, y'all covers the numbers. We would only use all y'all when referencing people from foreign lands, like New York.
BJ, whether it is "y'all" or "all y'all" you were all (thats "All Y'all) a fine bunch of blokes to hang out with - squirrel abusers notwithstanding!