I came across this video from jiujitsu2000 on YouTube and he demonstrates how you can reload 12 gauge shotgun shells in a survival situation. Now, this video isn’t a complete MacGyver take on reloading. You won’t learn how to chop up pieces of coconut to make this work. His methods require some of the normal materials you would need to have on hand for regular reloading with the proper equipment, but he does give some alternatives to some of the regular pieces of equipment.
If you happen to find yourself with some basic reloading supplies, this video might help you come up with your own reloading solution that can give you the ability to reuse some of your spent shotgun cases.