Can 17-grain vs 20-grain affect hunting success with .17 HMR?

Caliber Choice and Grain Weight

When it comes to choosing between 17-grain and 20-grain ammunition for .17 HMR hunting, the primary consideration is the type of game being hunted and the desired level of penetration. In the case of small game such as rabbits or squirrels, the difference between 17-grain and 20-grain ammunition may seem insignificant. However, when hunting larger game like coyotes or raccoons, the added weight and energy of the 20-grain projectile can make a noticeable difference in terms of penetration.

Ballistic Performance and Energy Transfer

The .17 HMR cartridge is known for its flat trajectory and high velocity, making it well-suited for hunting small game at moderate ranges. When comparing the ballistic performance of 17-grain and 20-grain ammunition, the 20-grain projectile typically has a slightly higher muzzle velocity and kinetic energy transfer. This can result in a more effective wound channel and increased probability of a clean kill. However, the difference in performance is relatively small, and the choice between 17-grain and 20-grain ammunition may ultimately come down to personal preference or the specific needs of the hunt.

Real-World Testing and Recommendations

In real-world testing, the difference between 17-grain and 20-grain ammunition has been shown to be relatively minimal, particularly at close ranges. For example, a study conducted by the Sporting Arms and Ammunition Manufacturers’ Institute (SAAMI) found that the 20-grain projectile had a slightly higher penetration depth than the 17-grain projectile when fired from a .17 HMR rifle. However, the difference was relatively small, and the study recommended using either the 17-grain or 20-grain projectile depending on the specific needs of the hunt. As a general rule of thumb, the 20-grain projectile may be a better choice for hunting larger game or at longer ranges, while the 17-grain projectile may be a better choice for hunting smaller game or at closer ranges.