Set up two IDPA/USPSA targets 6 feet apart, then shoot at them from 7 to 10 yards. For weak-hand practice, start with the gun in a low ready position. For strong hand, begin with the gun in the holster. At the start signal, deliver two rounds to the body and one round to the head of one target, then transition to the other target and do the same. This will force you to deal with both vertical and horizontal target transitions, and it’s a great skill builder for one-hand shooting.