Quick Answer
Temperature affects the ballistics of 6mm Creedmoor by altering the muzzle velocity, aerodynamics, and air density, resulting in changes to the bullet's trajectory, range, and accuracy.
Temperature Effects on Muzzle Velocity
Temperature significantly impacts the muzzle velocity of 6mm Creedmoor cartridges. For every 10-degree Fahrenheit change in temperature, the muzzle velocity of a 6mm Creedmoor cartridge with a 105-grain bullet will change by approximately 20-30 feet per second. For example, at 60°F (15.5°C), a common muzzle velocity for a 6mm Creedmoor with a 105-grain bullet is around 2,900-3,000 feet per second. In contrast, at 90°F (32.2°C), the muzzle velocity would be around 3,200-3,300 feet per second.
Temperature Effects on Air Density and Aerodynamics
Temperature also affects air density, which can impact the aerodynamics of the bullet. Warmer temperatures can reduce air density, leading to longer bullet flight times and increased wind drift. For the 6mm Creedmoor cartridge, a 10-degree Fahrenheit increase in temperature can result in a 1-2% increase in wind drift. This means that at 90°F (32.2°C), a 1-mph wind would cause a 1-2% greater deflection compared to 60°F (15.5°C).
Adjusting for Temperature in Hunting Situations
To account for temperature effects on ballistics, hunters can use ballistic software or tables to adjust their shots. For example, assuming a 100-yard shot at a 10% angle with a 6mm Creedmoor and 105-grain bullet, a 20-degree Fahrenheit increase in temperature would result in a 4-6 inch increase in bullet drop. Hunters can compensate for this by adjusting their aim or using a higher-powered scope.
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