Ping Pong
Objective: To introduce a little bit of pressure and evaluation to each shot
Skill level: Everyone who can scpe shots
Time: 1 partner - each with a card - and the time for a single detail
Background
Some people dont shoot well under pressure, and/or when things outwith their control are changed.  This exercise is designed to simulate the shots in an ISSF final and to put a wee bit of competition into each shot.
You need to be able to scope a shot and call it as a number.  We use outdoor scoring as a way to get that number. 
10.9
 A perfect shot-the white dot gone, the hole in the middle
10.8
 The white dot gone but the hole not central
10.7
 Almost but not clipping the white dot
10.6
 Getting close to the 10 ring
10.5
 Probably a 9, the white ring around the 10 has been nicked
10.4
 More in the 10 than inthe 9 ring but only just
10.3
 50% in the 10 ring 50% in the 9 ring
9-8-7-6
 As you would normally score them
If you shooting is not yet at this level just call 10/9/8 as you would normally score shots.

Technique
Choose a partner, shoot side-by-side on your own cards.

Get permission - make sure than people on the same detail are comfortable with you making a noise and calling your shots.

Sight in, and when you are ready announce it to your partner.

Then shoot each shot in turn. 

After the first person has shot - and before the next person shoots - they call our their score. 

The second shooter takes their shot and likewise calls the score. 

The person with the highest score wins the point for that target and shoots first on the next target. 

The winner is the one with the most points - not the one with the overall best card.

If it catches on there is no reason why you can't run a wee shooting ladder where you can challenge anyone up to 2 places above you in the table.