6.5 Grendel ammunition is a popular and versatile rifle cartridge known for its excellent ballistic performance and accuracy. It was developed in the early 2000s by Bill Alexander and Janne Pohjoispää and is designed to be fired from AR-15 style rifles. Here's a detailed description of 6.5 Grendel ammo: Caliber: The 6.5 Grendel cartridge is named after its caliber, which is 6.5mm (approximately 0.264 inches). This caliber strikes a balance between manageable recoil and long-range accuracy. Cartridge Design: The 6.5 prcammo is a bottlenecked cartridge, meaning it has a narrow neck and a wider body. This design allows for efficient powder combustion and consistent performance.