DF,
Other than long experience with measuring the H20 capacity of various cases probably not. But I've been doing it long enough to get a feel for which method was used. For instance, most .30-06 length belted magnums will have a capacity around80 grains, and "full length" belted magnums around 90 grains.
Once in a while there are surprises. .338 Lapua cases, for instance, are so heavy they don't have nearly as much room as you might guess, in fact not all that much more than the .340 Weatherby.
