Starline 6.5 Grendel Rifle Reloading Brass - 50 Count - The 6.5 Grendel was designed for use in an AR-15 type rifle to offer ballistics similar to the .308 Winchester, with less recoil. This flat shooting round utilizes the inherently accurate, high ballistic coefficient 6.5mm diameter bullet. Its short case length allows it to use some of the longer, heavier match bullets, making this caliber one of the best choices for long range shooting out of an AR. With proper bullet selection, this caliber is no slouch in the field either, being suitable for deer-size game as well as varmint hunting.