Those interested in WW2 German ordnance may like this on which covers 15mm-50mm ammunition. It is a lengthy slide show arranged by caliber, with numerous drawings and photos including many sectioned rounds and information from manuals, including a lot on fuzes. Looks like the basic language is Hungarian, but many of the slides have English, Russian, German or other language text, so it is fairly easy to use. Total of 215 slides in a slide show format.
Similar format but covering 75mm-600mm ammunition in 123 slides.