Quick Answer
For big game hunting, a flat trajectory is more important than expansion when choosing a controlled expansion bullet. This is because a flat trajectory ensures the bullet hits the target where you aim, while expansion is a secondary consideration to ensure the bullet effectively transfers kinetic energy to the target.
Trajectory Basics
A flat trajectory is essential for precision shooting at longer ranges. This is especially true for big game hunting where shots often exceed 200 yards. A bullet with a flatter trajectory will drop less between 200-400 yards, allowing for more accurate shots. For example, a 180-grain bullet with a ballistic coefficient (BC) of 0.5 will drop approximately 10 inches between 200 and 400 yards, while a bullet with a BC of 0.4 will drop around 15 inches.
Expansion Considerations
While a flat trajectory is crucial, controlled expansion is still vital for big game hunting. A bullet that expands properly will transfer more kinetic energy to the target, resulting in a cleaner kill. Look for bullets with a controlled expansion design that expands within a specific range (e.g., 1.5-2.0 GFM) to ensure the bullet effectively transfers energy. For example, the Barnes TSX or the Hornady InterLock are popular controlled expansion bullets that have proven effective in various hunting scenarios.
Choosing the Right Bullet
When selecting a bullet for big game hunting, balance trajectory and expansion considerations. Consider a bullet with a BC of 0.45-0.55 for a flatter trajectory, and look for controlled expansion designs that expand within a narrow range. Additionally, consider the caliber and grain weight, as these factors will also impact the bullet’s performance. For example, a 7mm Rem Mag with a 160-grain bullet may be more suitable for shorter ranges, while a 300 Win Mag with a 180-grain bullet may be more suitable for longer ranges.
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