Today I tested some 10mm reloads, for both velocity and accuracy. Accuracy has been an issue with my Glock 20 to a greater degree than other pistols I've owned, and I'm trying to find out what it likes, and whether there's something wrong with it. So far, the answer is "doesn't like anything." Accuracy is marginal at 10-15 yards, and downright lousy farther out. Here's a picture of the target I used today, with different reload groups indicated by color. I fired 15 rounds of each from a Weaver-ish stance at about 10 yards. Hold was with bullseye center resting on top of the front sight, using two hands, taking my time & trying to be as consistent as possible: Red: 5.4 gr. Titegroup under a 180 grain Rainier plated bullet (0.401" diameter). Cartridge OAL 1.270". Yellow: 7.0 gr. Unique, 180 grain Rainier plated bullet (0.401" diameter). Cartridge OAL 1.270". Green: 6.0 gr. Titegroup, 180 grain Rainier plated bullet (0.401" diameter). Cartridge OAL 1.270". Orange: 6.0 gr. Titegroup, 180 grain Hornady XTP hollowpoint bullet (0.400" diameter). Cartridge OAL 1.270". The loads using XTPs were most accurate, and also the most consistent in muzzle velocity: average 1113 ft/s, standard deviation a mere 11.21 ft/s. I'm used to seeing that kind of consistency in quality defense ammo, such as Hornady TAP, but not in my reloads, since I use mixed brands of brass that's been fired any number of times. I'm disappointed that this was the best group I could get at only 10 yards. The first three groups are just horrible, and all off to the upper-right for some reason. Though the smallest group, and centered in azimuth, the group of XTP reloads still has more spread than I would have liked. My Springfield XD, 1911s, and Glock 30 can all make one ragged hole at 10 yards, regardless of the ammo. So what's wrong with my Glock 20? Or am I expecting too much of it?