The bolt-action barrel blanks we offer give you unlimited flexibility in chambering your rifle to your favorite caliber, while also being compatible with a broad range of actions. Available in multiple calibers, lengths, contours and twist rates, each barrel comes ready to be threaded and chambered by your gunsmith. This is especially valuable for wildcat cartridges that don't have established specifications. Our PROOF RESEARCH barrels are designed to function safely within SAAMI and CIP pressure limits, making them reliable for most known cartridges. If you have questions about your rifle's safety or performance, our customer service department is here to assist you. Exhibits exceptional durability with superior erosion resistance and corrosion protection The material exhibits exceptional pressure resistance, characterized by an optimal blend of high-tensile strength and necessary toughness to endure the extreme chamber pressures experienced during firing Twist rate - 1:10 Shank diameter - 1.20 inches