I don't have much to add other than a quick report on these hot glue projectiles. I'd never considered such a thing until I saw this and just had to try it.
I used a Lee .358 158g flat point mold and sprayed it with cooking spray. I found that filling the cavities through the sprue plate didn't work so well, so I filled the cavities and then closed the sprue plate once the glue hardened to cut the excess from the bases. The glue bullets weighed right around 13.5g.
I drilled the flash holes to .125" and trimmed cases to .75" (I may experiment with an even shorter case length in the future but for now I just wanted them short as an obvious identifier that the flash holes were enlarged to prevent mix-ups). CCI small pistol primers were used.
I fired the rounds from a Taurus M66 6" revolver in a 2 car garage with doors closed at a distance of about 7 yards. The report was similar to an enthusiastic handclap. I peeked out the door at my neighbor who was doing yard work and she didn't even seem to notice, lol. All shots grouped about 3" low and 1" right of POA. I fired into a midway shipping box stuffed with hazmat air bubble cushions with another box stuffed with rags behind. 1 of the 6 rounds penetrated clean through the first box but did not enter the second.
This concept was really interesting to me and I will certainly be doing more experimentation soon, but for now I just wanted to give my 2 cents on the matter and let
@Obturation know that some of the interested parties have indeed tried his idea.