What aspect of firearm practice can be directly influenced by sighting in?

Sighting in a firearm primarily involves adjusting the sights of the weapon so that the point of aim aligns with the point of impact. This process directly influences the bullet's trajectory, as it ensures that when the shooter aims at a specific target, the bullet will follow a path that accurately reflects that aim.

When a firearm is properly sighted in, the shooter can anticipate where the bullet will strike the target based on the adjustments made to the sights. This is crucial for precision shooting, as even small misalignments can lead to significant deviations in bullet impact at varying distances. Therefore, by sighting in effectively, a shooter can ensure that their aiming point corresponds accurately to where the bullet will travel, resulting in improved performance and consistency in shooting.

The other options, while they pertain to firearm practice, do not have a direct connection to sighting in. The type of gun used relates more to the features and characteristics of the firearm itself. The shooter's mental state can impact overall performance but is not directly influenced by sighting in. Lastly, the overall cost of shooting involves various financial considerations unrelated to the technical adjustment of the firearm's sights.