One of my current favorites is called the Balance of Speed and Accuracy (BSA).
6 shots to first target, no time limit. Grouping is key.
6 shots to second target, only speed matters. Time it.
6 shots to third target, as fast as you can guarantee hits in the target area (like "A-zone" in USPSA target). Time it.
To increase the difficulty, add some movement. Start behind cover. Or add a reload in the middle. Or instead of shooting each phase at 1 target, make it 2 or 3. Get creative.
It gets you thinking, but just like every other good drill, you learn that you can't miss fast enough to win a shootout.
"Laws that forbid the carrying of arms... disarm only those who are neither inclined nor determined to commit crimes." - Thomas Jefferson's "Commonplace Book," 1774-1776, quoting from On Crimes and Punishment, by criminologist Cesare Beccaria, 1764