Quick Answer
Temperature impacts 7mm PRC ballistics by affecting the bullet's expansion, velocity, and trajectory. In warmer temperatures, the bullet's velocity and expansion are reduced, while in colder temperatures, the bullet's expansion is increased, potentially leading to deeper penetration. This can be critical for elk hunting.
Understanding Temperature Effects
Temperature affects the 7mm PRC cartridge’s performance in several ways. The bullet’s expansion is influenced by temperature, with expansion increasing at lower temperatures and decreasing at higher temperatures. For example, a 7mm PRC bullet may expand more at 20°F (-7°C) than at 80°F (27°C), potentially resulting in deeper penetration.
Ballistic Coefficient and Temperature
The ballistic coefficient (BC) of a bullet is also affected by temperature. The BC of a 7mm PRC bullet with a BC of 0.625 at 70°F (21°C) may decrease to 0.585 at 20°F (-7°C) and increase to 0.655 at 80°F (27°C). This change in BC can affect the bullet’s trajectory and range, making it essential to use a ballistics program that accounts for temperature when calculating wind deflection and trajectory.
Temperature Considerations for Elk Hunting
For elk hunting, it’s essential to consider the temperature when selecting a hunting location and estimating bullet performance. Elk are often hunted at higher elevations, where temperatures can be cooler. In these conditions, a 7mm PRC bullet with a high BC and controlled expansion can be an excellent choice, offering deep penetration and accurate trajectory. However, in warmer temperatures, a bullet with a higher expansion rate may be more suitable, as it can create a larger wound channel and increase the chances of quick kills.
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