I have several good ones.
From sling, muzzle down, weak shoulder: Stand at the line in front of two paper plates each at about 10 yards with a partner who has a holstered pistol. When he sees you begin to bring the rifle up, he tries to draw and put a hole through each paper plate before you can. If you practice, you can beat him if he's not too fast. At 15 yards it's a wash. At 20 yards the course belongs to the rifleman.
Another way to do it is to have three plate up, with the center one being the stop plate. The shooters each punch their side outer plate and the first to hit the center one wins.
Then there's the
intermediate force/carbine/pistol transisiton drills we were practicing last year.