What is Bullet Grain?


If you are a new gun owner, you might have wondered what the abbreviation “gr” on the side of a box of ammo means. “Gr” indicates the grain of the bullet, which makes a big difference in how your weapon fires. Bullet weight is an important factor that can impact other variables like recoil, accuracy, and ballistics. Understanding grain will help you get the most out of your firearm.

Defining Bullet Grain

Bullet grain is equivalent to the weight of the projectile. It is an extremely small unit of measurement, equal to 1/7,000th of a pound or 1/437.5th of an ounce. For context, a sheet of paper weighs about 77 grains. A higher grain indicates a heavier bullet.

Why Is Bullet Grain Important?

Bullet grain is important to consider depending on what you are using your gun for. For activities like plinking and close-range shooting, the weight of the bullet does not have much of an effect on your performance. When you are using your firearm for self-defense, hunting, and precision shooting competitions, however, grain matters a lot.

The weight of the bullet can determine how well the shot will travel through the elements, including wind, rain, and even gravity. It is crucial to use the correct bullet grain when hunting in these conditions so your shots are as accurate as possible. For shooting competitions, precision is the key to success, and the right grain can make or break your shot.

Different Types of Bullet Grain

Ammunition comes in a wide range of sizes. Some of the smallest bullets weigh in at 15 grains, while others can be upwards of 700 grains. There are multiple bullet weights that are compatible with each caliber of gun. The most popular for 9mm loads are 115, 124, and 147 grains, while a classic AR-15 commonly uses 55-grain bullets.

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How to Choose the Correct Bullet Weight

When choosing the correct bullet grain for your weapon, it is important to consider what you are using your gun for so you can weigh the pros and cons of light and heavy grains. For distance target shooting, lighter bullets are more effective, while heavy bullets are well-suited for self-defense and hunting big game.

Lighter Grain

Lighter grain ammunition generates more speed overall than heavy bullets. This results in maximum accuracy and a straighter trajectory over a longer distance.

While light grain bullets are fast, they sacrifice energy to maintain their accuracy. Less energy makes them more susceptible to wind and can be easily blown off-target. Light ammunition will also do less damage to your target.

Heavier Grain

Heavier grain bullets are way less affected by wind and other elements than light bullets are, making them a great option for hunting. Their weight generates a lot of stopping power as well, which better penetrates the target.

Due to their weight, however, heavy ammunition struggles to maintain the velocity needed for a stable flight path. They will not go the same distance that a lighter grain bullet will. Heavy bullets are also known to generate a greater recoil.

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To browse our inventory, visit us at any of our Arizona locations or look through our website.
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Ethan Smith is a seasoned marine veteran, professional blogger, witty and edgy writer, and an avid hunter. He spent a great deal of his childhood years around the Apache-Sitgreaves National Forest in Arizona. Watching active hunters practise their craft initiated him into the world of hunting and rubrics of outdoor life. He also honed his writing skills by sharing his outdoor experiences with fellow schoolmates through their high school’s magazine. Further along the way, the US Marine Corps got wind of his excellent combination of skills and sought to put them into good use by employing him as a combat correspondent. He now shares his income from this prestigious job with his wife and one kid. Read more >>