Abstract: Ammunition measurement tools include a frame having a reference surface adapted to contact a first caliper jaw of a pair of calipers, a gauge element attached to the frame and movable, the gauge element defining a plurality of apertures of different selected diameters, each aperture diameter corresponding to a diameter of a selected part of a cartridge, the gauge element being operable to move to position a selected aperture in registration with a second jaw of the pair of calipers such that the distance from the aperture to the second jaw may be measured to determine a length dimension of a cartridge positioned in the aperture. The gauge element may be rotatably connected to the frame to rotate about an axis. The frame may include an attachment facility operable to secure to the jaw of a pair of calipers.