What factors should be considered when sighting in a rifle?

When sighting in a rifle, it's essential to take into account factors such as gravity, air resistance, and energy loss. These elements play critical roles in how a bullet behaves once it leaves the barrel.

Gravity affects the bullet's trajectory by pulling it downward as it travels through the air, requiring the shooter to adjust their aim to account for bullet drop over distance. Air resistance, or drag, slows the bullet's speed as it travels, which can also impact accuracy, particularly over longer ranges. Energy loss is important as well since a bullet will lose kinetic energy as it travels, affecting its performance when it reaches the target.

These considerations help ensure that shooters can make precise adjustments to their aim and improve their accuracy when targeting at various distances and under different environmental conditions. The other options, while they mention various aspects that may seem relevant, do not encompass the comprehensive physical forces that directly affect the bullet's path and impact.