So I got a chance to try out my new G20SF and a few different powders. I loaded up ladders for Bluedot, 2400, VV-N105 and VV-3N37. The ladders were from book start loads to max (.1gr over max with the VV-N105 and I was using PD 180gr FMJ. The first thing I noticed was how light the felt recoil seemed for loads that were easily pushing past 600ft/ft-lbs of ME. The second was the amazing accuracy the Glock provided with my best loads of each, right there with my best 1911's. I was at a local indoor range, so no Chrony, just looking at brass signs and testing the two recoil springs I had with me (stock and 22lb). On the max book loads the brass was really getting flung with the stock spring. When I switched to the 22lb spring, the distance I had to walk to find my brass was cut substantially. I tested the 22lb spring with every powder's start level and it functioned perfectly, so I will stick with the upgraded spring. Another observation is none of the loads tested seemed to do anything abnormal to the brass (I was using the stock Glock barrel), so it seems at least with these powders max book loads are fine. When my KKM barrel arrives, I will find time to get out to where I can setup my Chrony and see what some serious +P hog loads look like. I also plan on trying some Longshot and 800x, although right now the VV-N105 seems to be on the top rung of the totem. This gun is more fun than a barrel of monkeys.