It is similar to sporting clays, FITASC, trap, and skeet.
There are typically 3 traps (target throwers) at each station.
Typically this is only done for large events where a greater number of shooters need to get through the course.
If the two hoop-method is used, a course does not need as many traps as it would if it were set up as a typical report/true pair sporting clays course of the same number of targets.
Typical targets are rabbits, chandelles, overheads, crossings, traps (outgoing), teals (launched straight up into the air), and incoming birds.