DF,
Any method as long as it is consistent would give you a great way to compare a cartridge to another....if you were the one doing all the measurements. I have had up to 3gr difference in capacity of the same size case by different manufacturers.
I like the case load capacities listed in Nosler's manual and Quickload software. I'll take a measurement of an unfired 26Nosler case just for grins.
SCP
