So, I went camping with my Glock 19 and various other firearms, but got a good video of shooting Speer Gold Dot Hollow Point 127gr +p short barrel hollow points into milk jugs filled with water. Here's a photo of 3 of them. I'll update with actual expansion numbers and weight loss. One round traveled through one jug and entered the second where it stopped. It expanded to nearly an inch. The second two traveled into the third jug and expanded less.
