Can't find the article but believe it was also from accurate shooter, they weighed several brands of cases and even though the weights varied widely the capacity range differences was fairly small. It was even less than what Steve Redgewell found, I doubt this is true for all cartridges but it was for the 243 cases that were weighed in their sample. MD has explained his method or water capacity using a seated bullet several times, I think this is the best way after all bullet prep has been done and after two firings.

"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli