I'm currently putting together a few ideas for the shotgun videos. Several people have suggested wooden slugs. I purchased some 5/8" (15mm) wooden dowel and am fabricating a handful of wooden darts. These are 2½" long. Any longer and they would be hard to load into the pump shotgun.
In order to try to stabilize them so they fly straight, I put folding fins on them and weighted the noses with lead shot. They are huge but weigh less than half an ounce.
Another load I put together are Nerf darts. I have doubts they will work. In order to strengthen them, I reinforced them and put some lead shot inside to balance them, similar to the wood darts.
Finally, I am revisiting hot glue slugs. I am using Federal birdshot loads this time and these have a 2 piece wadding. The glue/leadshot slug will adhere to the shot cup but there will be no trailing wadding which should eliminate the weird "wagging" issue. I am putting lengths of thread to trail behind them to see if that will stabilize them. It's more of a gimmick but it may prove interesting.
I went to our local Walmart today to see what the ammo shelf looked like and it was even worse than it was a few weeks ago. Another shopper said it looked like Old Mother Hubbard's Cupboard. I was hoping to get 100 rounds of 12ga but they had none. They did have a lot of 20ga shells though.