In Singles shooting the trap shall be so adjusted that within the normal distribution of angles as thrown by the trap, the right angle shall not be less than 17 degrees measured to the right of center (3BF), and not less than 17 degrees measured to the left of center (3BF), with a total angle between outside target limits of not less than 34 degrees.

For more details see ATA Rulebook: 2011 ATA Rulebook

ATA Website: www.shootata.com