This past week: I tried determining the penetration of the subsonic .22 Hornet load I've developed as part of a review of the ballistic evidence in the JFK assasination. Unfortunately, my test media was not wide enough to contain the full path of the bullets, which exhibit a distinct tendency to produce a curved path in water. Looks like the more massive bases cause the bullets to yaw in water. It's a well-documented effect that many ammunition designers have exploited in order to cause bullets to tumble and disintegrate in soft tissue. At the low speeds I'm working with, however, bullet distortion is very mild and penetration is actually quite high, considering the relatively low energy. One test bullet with a muzzle velocity of about 950fps penetrated 20 inches of water before exiting side of the media at an unknown speed. I've already shown that this load produces the right general effects to be a close match to the ballistic evidence. Perhaps I'll stop at that. Or maybe I'll build a better test rig and try again to refine my data.
I fit the replacement trigger assemby to the test Nambu Type 14 pistol I've been tinkering with, but there's a lot more to be done before that project will wrap up with a defensive shooting evaluation. Along the way I'm going to have to learn to weld. And I'll probably do several welding projects together. I still need to weld up a cracked Astra 400 frame and test the strength of the repair.
It may seem odd, coming from a guy who likes to shoot, but that damn oxy-acetylene welding torch scares the hell out of me. Feels like I'm holding a jet engine in my hand. So, that's going to take some practice and familiarization before I can really get to the work.