You're right! I didn't remember rightly. There's no reason not to trust the Wikipedia article. Apparently there were about 1100 people ("Argies") on board when it sank, but more than 700 were rescued by Argentinian and Chilean ships.

Still as you say it doesn't change my point, which was, crudely speaking, that a female bastard is not worth more than a male bastard... (irrespective of whether you agree with me or not that sinking the Belgrano was a bastardly deed; and by the way we Frenchmen have not much reason to be proud that a French missile sank the Sheffield).