Quick Answer
Switch from 150gr to 165gr loads when hunting larger deer species, typically those weighing over 200 pounds, or when hunting at longer ranges, beyond 200 yards. This weight increase provides additional kinetic energy and penetration capabilities. The optimal transition point depends on individual rifle performance and deer density.
Understanding Deer Size and Weight
When hunting with a 308 Winchester rifle, consider the size and weight of the deer you’re targeting. Larger deer require more kinetic energy to effectively harvest. A general rule of thumb is to switch to a heavier load when hunting deer weighing over 200 pounds. This accounts for the larger bone structure and muscle mass found in these animals.
Load Selection and Ballistic Performance
The 150gr load typically produces around 1,900-2,000 ft-lbs of kinetic energy at the muzzle, which is sufficient for smaller to medium-sized deer. However, for larger deer, a 165gr load can increase the kinetic energy to approximately 2,200-2,300 ft-lbs, providing additional penetration and expansion capabilities. This is particularly important at longer ranges, where the energy transfer can be compromised.
Practical Application and Range Considerations
When hunting at ranges beyond 200 yards, it’s generally recommended to use the heavier 165gr load to compensate for the energy loss due to distance. This is especially true for larger deer or those with thick coats, as the additional kinetic energy can help ensure a clean harvest. Always consult your rifle’s ballistic charts and consult with a ballistician to determine the optimal load selection for your specific hunting scenario.
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