The 6.5mm Grendel (6.5×38mm) is an intermediate cartridge designed by Bill Alexander and Janne Pohjoispaa as a low recoil, high accuracy, 200-800 yard cartridge specifically for the AR-15 platform. Since its introduction it has proven an excellent and versatile design and is now expanding out into other platforms including bolt action rifles and the Kalashnikov system.
The name "6.5mm Grendel" was a trademark owned by Alexander Arms until February 15, 2012 when it was legally released to allow the cartridge to become SAAMI standardized. The release of the trademark removes the requirement of manufacturers to seek the permission of the trademark holder to use the mark.
Read more about 6.5mm Grendel: Development and History, Performance