Originally Posted by 22_boomer
This is important to know since it means that those plastic bullets can cause some damage at short range.
Yes they will. I sent some Delrin bullets to a guy and he used them with a 1911 and SW 19. He got them to go through a 2x4" but with a piece of carpet in front of it, they would bounce off. Again this was with 6gr of Clays.
Test results. Gun was my. 45 ACP Colt. After playing around with a few powder weights, I settled on 6 grains of Clays. That is hotter than any load published, but the delrin bullet is lighter than any published. Long story short, point blank that load would go thru a pine 2x4. Sounds good, right? Wait... with a single layer of carpet in front, the bullet would often only go as deep as the base of the bullet. (Carpet did not have padded backing) At about 10 feet, penetration varied greatly. Many times it would got thru the carpet and bounce off the pine stud. Even at point blank range, nothing but the first layer of plywood behind the stud was damaged, and then nothing more than a slight dent. The biggest surprise to me.... yes, I was surprised it went thru the stud yet at 10 feet it was totally stopped, but to me the shock was after making a dozen bullets, for all those shots I only used TWO. Each bullet was easily used again! The bullets I turned were very much more pointed than any. 45 bullet commonly available. Also, the total lack of recoil! My commander slide never went back any farther than enough to bring the hammer to half-cock.