The 10-10-10 drill, originally designed by Ken Hackathorn, is a straightforward yet effective exercise for improving speed and accuracy. Using a B-8 Center bullseye target, the drill requires you to start from 10 yards away and fire 10 shots within 10 seconds, aiming to land all rounds in the black. While relatively easy for experienced shooters, the drill can be made more challenging by drawing from concealment and stepping off the X before firing. This adds an element of movement and realism, making it an excellent drill for honing both basic marksmanship and defensive shooting skills.