Krieger 1903 A3 Barrel The Krieger 1903 A3 barrel is chambered in .30-06 Springfield, bringing match-grade precision to this legendary rifle platform. Built with Krieger's renowned single-point cut-rifling and hand-lapped bore, this barrel delivers the accuracy, consistency, and service life demanded by serious shooters. Whether for competition, restoration, or range work, the .30-06 Krieger 1903 A3 barrel ensures smooth performance, reliable bullet stabilization, and the precision edge that sets Krieger apart. 4 Groove 1-10 twist Rate Made of 4140 stainless steel 3.5lbs