Have you ever wondered what would happen if you took 10 different kinds of Pistol Powder, where there is literally ZERO load data, and then loaded up 20+ different loads and went to range? We just wanted to find out how it all worked, so we tested, massively. We chose the most accurate bullets we are aware of, Berger 55 Grain, flat base. We took the time to measure each case for internal capacity close to one another, and then we bought a bag of cotton balls and started loading ultra precision, hopefully subsonic (4) 5.56 loads for the AR15. Read on to see if we lived, because many told us this was incredibly dangerous. But of course, do NOT use this load information, and DO NOT do what we do. Always, always, follow load data from Manufacturers. We are experts in reloading, and experts in a few calibers. We use precautions when going where no man has gone before... Do not do what we do. This is for scientific testing purposes only. This seems like a good lot of powders to test? If you like this test and others like it, please donate to our site if you can, it helps us make more tests and grow the site. We want to start making videos, but don't have the know how:(