USSOCOM is looking for a new sniper rifles, different from Precision Sniper Rifle, which was won by Remington in 2013. The ASR program is still in its first few steps, so not much is out, but according to the Long Range Shooting Handbook, USSOCOM is looking to use .300 Norma Magnum for the cartridge.
https://www.longrangeshootinghandbook.com/socom-chooses-300-norma-mag-asr/
From: Long Range Shooting Handbook vis SSD
