Secret Service Snipers Were Strategically Placed Against Threats at the Trump Rally
New York Times
In photographs of the Secret Service snipers, they appeared to be using long-range and powerful rifles that likely fire .300 or .338 cartridges, commonly used by well-trained military snipers.
https://www.nytimes.com/2024/07/14/us/politics/secret-service-snipers-trump-rally.html