The SD has approx 200kg of filling for a total 535kg weight (metal casing included) while the SC has 220kg of filling for a total of 500kg weight (metal casing included).
There was only one version of the SD-500 with "approximately" (as your source calls it") 200kg, and that was actually the SD-500 at 180kg I mentioned in my post. The majority of the main SD-500 had less filling, down to 75kg. The yalso had very much differing sizes, from 396mm diameter to 447 mm diameter and 1744mm total length to 2022mm total length. The aforementioned SD-500A with 180kg filling was the biggest one. The website you give is giving very genrealized weigths and dimensions.
