Abstract: A firearm barrel comprising of an elongated barrel body defining a bore and having a breech end and a muzzle end. The bore includes a rifled surface with rifling having a gain twist with a twist rate of a first amount proximate the breech end and a greater second amount proximate the muzzle end. The rifling having an eased rifling profile along the length of the rifling. The eased rifling includes a radiused transition from lands to grooves and is continuous and smoothly transitioned from the groove articulated at a vertex from the land. The eased rifling includes angled surfaces transitioning between lands and grooves with angled surfaces angularly offset from radial to the bore or are offset from adjacent grooves by an obtuse angle or are offset from adjacent lands by an obtuse angle.