This 3d model is just a container with the form of a shotgun shell; Normal size for tiny things.

Entire model: 134.84mm tall with the lid on. 54.66x54.66mm wide and easy to print without supports.
Shotgun shell brass: With a height of 37.01mm and a width of 54.66x54.66mm.
Shotgun shell hull: It is 110.07mm high and 51.49x51.49mm wide

Perfect for PLA, Nylon, ABS, PET, PETG and a lot of different filaments.