Our creation of a bolt action barrel blank has opened up new possibilities for adapting your preferred caliber and accommodating various actions. We offer bolt action barrels In a wide range of calibers, lengths, profiles and rifling twist rates. Your chosen gunsmith will receive your bolt action barrel ready for threading and chambering. It's important to understand that while proof Research's barrel blanks can be customized with different chambers, we cannot guarantee specific performance metrics like accuracy, muzzle velocity and bullet stability. This caveat is particularly relevant for wildcat cartridges without standardized chambers, designs or pressure specifications. Although our barrels are engineered for safe use with most established cartridges within SAAMI and CIP pressure thresholds, caution is advised for unique rifle builds. If you have safety concerns or questions about the potential performance of your intended rifle assembly, please reach out to our customer service department.