65G and Future Urban Warfare

[85_Ranger4x4]

Dubbed the .264 USA, the Army Marksmanship Unit at Fort Benning, Georgia, has been shooting a prototype intermediate caliber round for years. Similar to the 6.5 Grendel but with a case sized for use in a standard M4 magazine, the .264 USA has an 800 meter effective range and better terminal ballistics further out than a 5.56.

https://www.wearethemighty.com/articles/...e-numbered

It wouldn't surprise me if they were wrong on that, I couldn't find much on it myself. That is where I read it though.