If I had a Dollar every time someone asked how far you can “reach out” with a .223 Remington…
With the Airborne Arms HERJA AR-15 in .224 Valkyrie there’s no need to ask that question.
According to the manufacturer it’s the the worlds first 1300 yard supersonic AR-15 cartridge. If you like you can read more about the caliber in Nathaniel’s TFB article.
The tests were conducted using the .224 Valkyrie 90 gr SMK in a 24″ barrel.
The name Airborne Arms comes by the fact that the company was started by a Combat Veteran and Airborne Infantryman who served and deployed with the 1/509th Airborne Infantry.
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source: http://www.thefirearmblog.com/blog/2017/10/19/airborne-arms-herja-1300-yard-supersonic-ar-15-cartridge-224-valkyrie/