Quick Answer
For Mule Deer hunting, the 6.5-284 Norma offers improved long-range performance and reduced wind drift, while the .308 Winchester provides a flatter trajectory and a wider selection of ammunition. However, the 6.5-284 Norma's smaller case size can be a drawback for some hunters.
Ballistic Advantages
The 6.5-284 Norma has a significant advantage over the .308 Winchester when it comes to long-range shooting. Its smaller case size and lighter bullet produce less wind drift, allowing for more accurate shots at 400-600 yards. In contrast, the .308 Winchester’s heavier bullet and larger case size can make it more challenging to compensate for wind drift at similar distances. For example, a 6.5-284 Norma-loaded 139-grain bullet will drift about 7 inches less than a .308 Winchester-loaded 150-grain bullet in a 10 mph wind at 500 yards.
Hunting Considerations
When hunting Mule Deer, the .308 Winchester’s flatter trajectory and wider selection of ammunition can be beneficial for close-quarters and dense vegetation hunting. However, the 6.5-284 Norma’s improved accuracy and reduced wind drift make it a better choice for hunting in open country or at longer ranges. To maximize the 6.5-284 Norma’s performance, hunters should use high-quality optics and a stable shooting platform, and aim to shoot at angles of 30-40 degrees or less to minimize bullet drop.
Ammunition Comparison
Ammunition selection is critical when choosing between the 6.5-284 Norma and .308 Winchester. For the 6.5-284 Norma, hunters should look for bullets with a high ballistic coefficient (BC) and a weight of 120-150 grains. The Nosler 139-grain Ballistic Tip and the Hornady 140-grain ELD-X are excellent choices. For the .308 Winchester, hunters can opt for heavier bullets (150-180 grains) with a BC of 0.5 or higher, such as the Sierra 165-grain GameKing and the Federal 168-grain Gold Medal.
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