Reigning Olympic champion Virginia Thrasher missed out on a place at the Lima 2019 Pan American Games at United States trials.
The 22-year-old won the first gold medal of Rio 2016 when she triumphed in the women's 10 metres air rifle.
She could only finish sixth at the American qualification event at Fort Benning, however, with the top two booking a place in Lima.
Alison Weisz topped the standings with Mindy Miles second.
In the women's 10m air pistol, former Bulgarian athlete Miglena Todorova came out on top for her new country.
Todorova, who represented the European nation at the 2006 World Championships, was considered a surprise package as she led Colombian-born Nathalia Tobar to Peru.
Olympian Nick Mowrer won the men's 10m air pistol in front of James Hall with the men's 10m air rifle going to Tim Sherry ahead of Rio 2016 shooter Lucas Kozeniesky.
Lima 2019 will take place between July 26 and August 11.
Shooting will take place at Las Palmas Air Base and offer quota places for the Tokyo 2020 Olympics.