Which type of reamer is specifically designed to recut the chamber of a shotgun?

The type of reamer specifically designed to recut the chamber of a shotgun is called a finish reamer. Finish reamers are precision tools that create a smooth, accurate finish in a pre-existing space. In the context of shotgun chambers, they are utilized after the initial machining to refine the chamber's dimensions to ensure proper fit and functionality. This results in improved performance and reliability of the shotgun by allowing the chamber to accommodate cartridges correctly.

The finish reamer removes a minimal amount of material and is calibrated to achieve tight tolerances, making it ideal for achieving the necessary specifications required for shotgun chambers. It plays a critical role in ensuring that the firearm performs as expected and adheres to safety regulations. Knowing the correct tool for this specific task is essential for those involved in firearms maintenance and repair.