"(b) Targets shall be thrown from an automatic angling trap that has been set in the equivalence of the #2 target spread hole of a Winchester model #1524 hand set trap. All automatic angling traps not having the ability to be placed in the #2 target spread hole will be set to throw targets at angles of, no less than a straight away from firing point #1½ to the right and firing point #4½ to the left, or more than a straight away from firing point #1 to the right and firing point #5 to the left of the imaginary line through firing point #3 and the trap."
And for your reading pleasure, their shell charge and velocity rules:
"(c) Any load with a maximum velocity greater than 1290 FPS (Feet per Second) with a maximum shot charge of 1 1/8 ounces (31.89 grams). For 1 ounce loads (28.30 grams) the maximum velocity is 1325 FPS; for 7/8 ounce loads (24.80 grams) the maximum velocity is 1350 FPS as measured in any individual shot shell. In addition, no load containing more than 1 1/8 ounces (31.89 grams, tolerance +3%) and shot larger than number 7 ½ chilled shot can be used. The above standards replace the old standard of no load heavier than 3 drams equivalent of black powder."
Looks like both exactly mirror ATAs
