How does fire lapping contribute to a rifle's performance?

Fire lapping is a process where specially coated bullets are fired through a barrel to enhance its internal surface. This technique contributes to a rifle's performance primarily by smoothing and refining the bore texture. Over time, manufacturing processes may leave imperfections or rough spots in a barrel’s interior, which can affect accuracy by causing uneven bullet travel and increased friction. Fire lapping helps to address these issues by polishing the inner surface, leading to a more uniform bore and, consequently, improved bullet performance.

As the bullets pass through, they wear down and smooth out any rough areas, which can result in better gas sealing, reduced fouling, and less drag on the projectile. This enhancement generally leads to increased consistency in velocity and accuracy as the bullet travels more smoothly down the barrel.

In contrast, options mentioning compromises to drill geometry, alterations to the original design, or increases in chamber pressure do not accurately represent the benefits of fire lapping. Instead, the focus is on the refinement of the bore itself, which is crucial for optimal rifle performance.