The distance a bullet travels before engaging the rifling of a barrel is a critical factor in optimizing cartridge performance. This dimension, typically measured in inches, influences pressure curves, velocity, and overall accuracy, especially in precision rifle applications. For a 6.5×47 Lapua cartridge utilizing a 140-grain projectile, specifying the appropriate measurement is crucial for achieving optimal results.
Selecting the correct length can yield several advantages. It can allow handloaders to seat bullets further out, potentially increasing case capacity and thus velocity. It can also be tailored to specific bullet designs, ensuring consistent and stable bullet entry into the rifling, which enhances precision. Historically, custom gunsmiths have meticulously adjusted this dimension to fine-tune rifle performance for competitive shooting.
