6.5 Grendel Vs. 300 Blackout: Which Should You Choose In 2022?

6.5 Grendel Vs. 300 Blackout: Which Should You Choose In 2022?

What are the qualities you opt for when choosing a rifle cartridge? Is it recoil power, accuracy, or damage? Regarding these factors, the 6.5 Grendel and 300 Blackout pellets always shine as high-quality rifle pellets.

If you have narrowed your purchase decision to the two cartridges, don’t skip this post. I will compare the 6.5 Grendel vs. 300 Blackout based on adept gunner’s experience and real-shooting tests.

The Differences Between 6.5 Grendel Vs. 300 Blackout 

A cartridge’s weights and specs are the most critical factor that decides its shooting performance.

Let’s first take a look at the core differences between these two cartridges.

Comparison Table

Features 6.5 Grendel 300 Blackout
Date Of Production 2003 2010
Case Type Rimless Rimless
Bullet Diameter 0.264 inches (6.71 mm) 0.308 inches (7.8 mm)
Total Length 2.26 inches (57.5 mm) 2.26 inches (57 mm)
Case Length 1.52 inches (38.7 mm) 1.368 inches (34.7 mm)
Neck Diameter 0.293 inches (7.44 mm) 0.334 inches (8.5 mm)
Rifling Twist 1 in 8″ or 1 in 9″ 1-8″ (203 mm)
Maximum Pressure 52,000 psi 56,565 psi

Bullet Weights And Sizes 

Regarding the bullet weights, the 6.5 cartridge has a lighter pellet weight than the 300 round on average.

The lower bullet grain is foreseeable since the 6.5 Grendel has a shorter bullet diameter than its counterpart (0,264 inches to 0,309 inches).

In general, the 300 round has more bullet grain options, ranging from 78 to 225 grains, while the Grendle weighs between 90 and 130 grains. The Grendel’s neck diameter is smaller than its counterpart, which is around 0.041 inches.

Last but not least, the 6.5 Grendel features a higher maximum pressure of 52,000 psi, while the figure for the 300 Blackout stood at 56,565 psi. If you have trouble handling the shooting pressure, the 6.5 Grendel might be more suitable.

The 300 Blackout Pellets Are Heavier
The 300 Blackout Pellets Are Heavier


When it comes to the trajectory, the cartridge that comes with a higher bullet grain gives a flatter shooting line.

The most common weights of the 6.5 Grendel can range between 90 to 130 grains, with 90 and 108 being the most popular.

Meanwhile, the heaviest 300 Blackout pellet reaches up to 220 grains in bullet weight. Based on this reason and many shooting tests, I can affirm that the 6.5 Grendel has a flatter trajectory than the 300 Blackout at many distances.

At a long shooting distance (more than 600 yards), the 6.5 Grendel cartridge remained relatively stable before hitting the target. Meanwhile, the 300 blackout typically drops after it reaches 300 yards.

This is the reason why many experienced shooters choose the 6.5 Grendel for long-range shooting distances. It gives more optimal accuracy, which is ideal for shooting competitions.

However, higher bullet weights have their own advantage, which lies in their ballistic coefficient. The 300 Blackout pellet with 220 grains can resist the wind impacts better than its counterpart.

Meanwhile, the 6.5 Grendel doesn’t ensure a flat and stable trajectory when shooting in windy conditions. It’s a critical factor that you should consider, especially for outdoor hunting or leisure shooting.


Experienced hunters will prefer the 6.5 Grendel cartridges at long distances for hunting because of their stable trajectory and high accuracy.

They can allow hunters to take down large prey at a distance of 600 yards.

A suppressor will be ideal if you can only use the 300 round in a hunting competition. This is a muzzle accessory designed to lessen the explosive crack of armor, allowing shooters to shoot more easily.

The 6.5 cartridge is also compatible with most short barrels, even 12 inches short barrels for hunting at 300 yards.

This cartridge can reach an outstanding distance of about 1000 yards, while its counterparts only stay effective at 300 yards. The Grendel is undoubtedly a superstar for any hunting trip.

However, if you shoot the target at shorter distances, the 220-grain 300 Blackout pellet is an ideal option.

It can penetrate the thick bones and skins more efficiently than the 6.5 Grendel, resulting in higher lethal damage.

The 6.5 Grendel Is Better For Hunting
The 6.5 Grendel Is Better For Hunting

Loading Type

Despite the differences in trajectory and price, these two cartridges feature the optimal hand load.

The 300 Blackout might have an advantage over its counterparts as it can accommodate numerous rounds in various magazines.

But when shooters use this cartridge for a 5.56mm AR rifle, they should be careful during the loading process as they can accidentally encounter serious injuries and firearm kaboom.

Meanwhile, the Grendel might have fewer options in magazine choices, but it comes with high-end material, allowing it to have higher endurance during the shooting process.

It surpasses the 300 Blackout as it is designed to be compatible with AR rifles, which carries fewer potential risks of handloading accidents.


You may think that the 300 Blackout is the definite winner due to its higher bullet weight on average, but it is not the case. I have conducted the shooting tests with all the pellet options of the two categories.

A 90-grain 6.5 Grendel generated 1,658 ft-lbs in energy, while the figure for the 90-grain 300 Blackout stood at 1,300 ft-lbs. Though they feature a similar bullet grain, the 6.5 Grendel comes out as the winner regarding energy.

This superior energy doesn’t change when it comes to heavier pellets. A 123-grain 6.5 Grendel Sierra Matchking cartridge generated 1,917 ft-lbs in energy, while the measured energy of the 125-grain 300 Blackout is 1,360 ft-lbs.

The reason may be attributed to the more optimized design of the 6.5 Grendel cartridges. They are simply faster and more lethal than the 300 Blackout pellets, making them an ideal option for self-defense and shooting.

The only advantage of the 300 Blackout lies in its 220-grain option. If you use a 220-grain 300 Blackout pellet, it definitely exceeds with higher energy and damage. However, the tradeoff is less accurate and has a less stable trajectory.


In general, the 6.5 Grendel is more affordable due to its superior performance. The demand for the 6.5 Grendel is significantly higher.

For this reason, the manufacturers produce this cartridge in higher quantities, causing its price to drop.

Shooters can easily find the 6.5 Grendel cartridges in the market at a reasonable price. They are ideal for both beginners and adept shooters.

If you want more in-depth comparisons between these two cartridges, consider watching the video below.

Choose The Pellet That Suits Your Purpose
Choose The Pellet That Suits Your Purpose

Final Verdict

I would always recommend the 6.5 Grendel cartridges for both beginners and professional gunners. It is simply a superior option, exceeding the 300 Blackout pellets in many critical qualities like accuracy, energy, and price.

The 6.5 Grendels are cheaper on average and come with higher energy due to the more optimal design. The flatter trajectory is due to its lower bullet weights.

Therefore, the 6.5 Grendel is the ideal choice for both hunting games and shooting competitions at far distances. Meanwhile, the 300 Blackout’s higher bullet grains give users more durability.

However, its inferior shooting performance is a noticeable tradeoff. I hope that you can choose a suitable cartridge for your needs after reading this post.

Thank you for your time!

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