Quick Answer
A heavier bullet in a 7mm SAUM rifle will typically result in a more stable and less prone to wind deflection trajectory, but this increased weight may also cause a slightly lower velocity and thus potentially less effective range and accuracy.
Bullet Weight and Trajectory
When selecting a bullet weight for a 7mm SAUM rifle, it’s essential to consider the trade-off between stability and velocity. In general, bullets weighing 120-140 grains have proven to be effective for elk hunting in this caliber. These weights typically result in a stable trajectory, with minimal wind deflection.
The Effect of Ballistic Coefficient
A higher ballistic coefficient (BC) also plays a crucial role in bullet trajectory. In the 7mm SAUM, bullets with a higher BC, such as the 140-grain Berger VLD, tend to perform better than those with lower BCs, like the 120-grain Sierra GameKing. This is because a higher BC indicates a more aerodynamic bullet, which will maintain its velocity longer and resist wind deflection better.
Real-World Performance
In real-world hunting scenarios, a 7mm SAUM rifle fired with a 140-grain bullet has been known to maintain accuracy out to 500 yards, with minimal drop and wind deflection. However, at longer ranges, the effects of bullet weight and BC become more pronounced. For example, at 700 yards, a 140-grain bullet may drop around 40 inches, while a 120-grain bullet may drop around 55 inches. This highlights the importance of selecting the right bullet weight and BC for the specific hunting situation.
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