This video, Part 2 of a home shop rifling series, explains the critical importance of heat treating a barrel *before* rifling. The creator details how the necessary hardness (Rc 28-32 for 4140/4150 steel) impacts the rifling process, requiring more force to swage the rifling but ultimately resulting in a stronger, tougher barrel. Key reasons for pre-heat treatment include preventing the rifling button from picking up steel and preserving the precise bore dimensions and straightness during the high-temperature heat treating and quenching process. Post-rifling heat treatment would compromise the strain-hardened bore surface, which significantly reduces friction and enhances wear resistance.
This video explores the process of hand-swaging bullets, taking bullet casting to a more advanced level. The creator acknowledges that this content is not their original work but expresses an interest in getting into swaging themselves. The video includes disclaimers regarding safety, legal compliance, and the educational/documentary nature of the content. It emphasizes that all activities are performed on approved ranges under professional supervision and advises viewers to exercise caution and adhere to all regulations when working with firearms.
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