The cartridge case database includes over 1200 standard cases with dimensions and case capacity values. The user may easily scroll through the available list and select one for use in handloading. If your cartridge case is not listed, then you may easily create your own custom case. You may enter dimensions (all or just the ones you know), case capacity, and typical overall cartridge length. The program will draw your case after providing it all the external dimensions. If you have taken all the case measurements including thickness values, you can request the program to calculate the case capacity. Alternately, you can determine it's capacity by weighing the case with and without water (the difference is the capacity in grains of water).