This is a great instructable to learn how to refill once fire shotgun shells. This specific instructable is made using a 12 gauge rounds, however the same methods.
Antique Shotshell Reloading Tool Bullet by alchemievintage on Etsy
The Lee Precision Shotshell Reloading Press All II is for tool with 24 shot and powder bushings. Loads 2 and 3 inch shells.