[suemarkp]

There are the exact same things the factory shot shells use. The capsule is the "Bullet" and you fill it with the size shot you want. They are smaller than normal bullet diameter (so the rifling doesn't engage them), but are the easiest way to get started with shotshell handloads. Be careful with crimping. You need to crimp because even without neck expanding, they fit too loose. But crimp too much and you crack the blue capsule.