Quick Answer
Altitude impacts .308 performance, with bullet drop increasing by approximately 1.5-2.5 inches for every 1,000 feet of elevation gain due to decreased air density.
Understanding Altitude’s Effect on .308 Bullet Performance
When hunting at high elevations, the decreased air density affects the trajectory of your .308 rifle. The reduced air resistance results in less drag, but also less lift, causing the bullet to drop more sharply than at lower elevations. The magnitude of this effect depends on the specific cartridge, but for a .308 Winchester, a 150-grain bullet, you can expect a 1.5-2.5 inch increase in drop for every 1,000 feet of elevation gain.
Compensating for Altitude with Ballistic Data
To accurately compensate for altitude, consult your rifle’s ballistic data and apply the appropriate adjustments. For a .308 at 2,500 feet elevation, for example, you may need to increase your point of aim by 15-20 inches to hit your target at 300 yards. To accurately estimate this adjustment, consult your rifle’s ballistic chart or use a ballistic calculator, inputting the elevation and distance to the target.
Practical Tips for Hunting at High Elevations
When hunting at high elevations, choose a .308 load with a high BC (bullet coefficient) to minimize drop, around 0.5-0.6 G1. Additionally, consider using a scope with a high magnification (12x or higher) to help compensate for the increased drop. Finally, always account for wind and other environmental factors when making your shot, as the increased drop can be unpredictable.
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