There are several variations to this, . . . but the basic goes like this:
Mark off 10, 20, 30, 40, and 50 feet.
Set up a target, . . . I like the 7 inch or so diameter paper plates, . . . big black aiming dot in the center.
Shoot 10 rounds at 10 feet, . . . count only "hits" (anywhere on the plate), . . . add up your score, . . . 1 point per round.
Shoot 10 rounds at 20 feet, . . . 2 points per "hit".
Shoot 10 rounds at 30 feet, . . . 3 points per "hit".
Shoot 10 rounds at 40 feet, . . . 4 points per "hit".
Shoot 10 rounds at 50 feet, . . . 5 points per "hit".
The ringer or kicker to this is that you cannot move to the next level until you have completed a full 10 consecutive hits on the current level.
You also have to shoot in "blocks" of 10 shots.
It can be one frustrating challenge, . . . especially if you drop one early on in the shooting, . . . trying to make up for it later on in the shooting series.
Anyway, . . . I like it, . . . and once you start shooting 150's at the 7 inch plate, . . . drop to a 5 inch plate, . . . that'll make ya do better
May God bless,