A real A&M is the "Bigfoot" of the quail world. I have yet to see anyone take a picture of a big one on a scale, or offer actual mature weights of these "alleged" birds. Anyone who is serious about breedin' consistant big meat birds, that doesn't have a scale, or isn't weighin' them at different ages to determine growth rates, is really missin' the boat.
A really decent scale that measures both grams and ounces can be obtained at any Harbor Freight store for about 15 bucks. Until I see anybody back up their claims as to these "big white birds", they're all just English Whites to me, with some just bein' slightly bigger than others.