I think the easiest way to describe extruded would be to say that it is rod shaped and usually has a small hole down the center. Extruded powders are used in many types of ammunition, from small arms to large cal. field or naval guns. Sizes vary from a few 1000’s in dia. to close to 1 in. in dia. The larger dia. types usually have multiple holes.
Ball powder is as the name implies, it is ball shaped or round. When looking at ball powder of any one type, you will see different size spheres.
If you have the accesibility to a loading manual from any of the powder makers or mast of the bullet makers, youwill find pictures of the different grades or types of powder.
If any forum member has a site in mind showing powder types please reply.