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.
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