Interesting stuff.
Personally, I like the Centurion 12ga loads that have a single .60 caliber steel ball in a finned plastic casing to impart spin. Turns your shotgun into a rather accurate musket.
On a different note, I like your posts but the format always looks messed up.
If you place an html paragraph separator ( <p> ) before your first picture link and after, it will align things nicely and make it more pleasing to the eye. Just sayin'.
Sort of like this:
This was based on a "pen shank" created by Michael Yeh. Greg from TAOFLEDERMAUS Youtuber gets a chance to shoot this needle at a clump of clay and jelly down range. Check out the results below. You can see the needle footage here.
Turns your shotgun into a rather accurate musket. I have slug molds along with various buck and round ball molds. I have always appreciated the creativity that loading custom shotgun cartridges allows as compared to reloading rifle and pistol cartridges. Strangely enough, I had not thought of printing out projectiles with filaments that are infused using my 3-D printer. This would seem to open up a new world of possibilities.
I have to admit that my favorites are likely to remain my Lee Slug molds. You would not believe how fast you can churn them out. They look like giant hollow cast bullets. You don't actually even need a shotgun shell press to use them. You can actually cut the end off of a birdshot cartridge using a knife or a special tool leaving the roll bead, remove the birdshot and then press a couple “nitro cards” and the slug into the shell in place of the birdshot. There are numerous videos showing how to do this on Youtube. It makes for a fun day at the range making big holes in stuff.
https://youtu.be/ku91XAyyN6c