For anyone shooting ATA those loads would not be allowed.
here it is from the ATA rulebook-
which can be downloaded here-
http://www.shootata.com/rulebook.htm
F. GUNS AND AMMUNITION
Any shooter violating any of these Rules shall be disqualified from
competition in accordance with these Rules. Any such violator shall
be referred to the Executive Committee for possible further disciplinary
action.
A contestant cannot use:
1. A gun with a chamber larger than 12 gauge. Guns of smaller gauges
are permissible in registered and tournament shooting, but no competitive
consideration shall be given in recognition of that fact for
handicap and classification purposes. Only ammunition provided by
the ATA and purchased at the time of entry may be used at, or during,
the Grand American Tournament. A contestant may not use a gun
capable of chambering more than one gauge of shells at the same
time. For example, chambering 12 gauge and 20 gauge shells in the
same gun at the same time is prohibited.
2. Loads that contain nickel or copper coated shot or tracer loads.
However, the use of lead, steel, bismuth, or other composite nontoxic
shot materials shall be allowed. Any gun club allowing shot
materials described in this Rule, other than lead, shall be required to
cover or shield all hard surfaces on trap fields which are known, or
reasonably believed, to cause pellet ricochet with material which will
prevent the shot pellets from rebounding and /or ricocheting.
3. Any load with a velocity greater than 1290 FPS (Feet Per Second)
with maximum shot charge of 1 1/8 ounces (31.89 grams), or 1325
FPS with a maximum shot charge of 1 ounce (28.30 grams), or 1350
FPS with a maximum shot charge of 7/8 ounces (24.80 grams), as
measured in any individual shotshell. These velocities are maximum
and no individual shotshell shall exceed these limits for the designated
shot charge. In addition, no load containing more than 1 1/8
ounces (31.89 grams) or any shot larger than Number 7 1/2 can be
used. Shot charges are maximum and no charge may exceed the
charge amount by more than 3%.
4. Any shell loaded with black powder.