The Black Hills 6mm ARC pushes a 103 grain Hornady ELD-X® at 2600 fps from an 18” barrel. Due to the higher ballistic coefficient and weight of the 6mm ARC projectile, it beats the best 5.56mm ammunition in terms of retained energy and reduced wind drift at all ranges. The trajectory is nearly identical to 500 yards, and past that range the 6mm ARC clearly has the advantage.This round is purpose built for the lighter and handier AR-15. More power, same package, what’s not to like?