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6.5 Grendel vs .308 Win.

Ballistics Performance Comparison of 6.5 Grendel vs .308 Win.

The 6.5 Grendel and the .308 Winchester have a lot in common: they are both comparably strong hunting calibers for medium game within 300 yards, and they are both popular in semi-automatic rifles, including the AR platforms. Still, they have important differences: the .308 Winchester does quite a bit better at longer distances, but also gives a more powerful recoil.

6.5 Grendel vs 308 Winchester

The .308 Winchester has been a popular big game hunting cartridge since it was released in 1952, and was part of the U.S. military’s effort to replace the .30-06 Springfield as its round of choice. The .308 Winchester was able to fit the same ballistics into a smaller bullet, making it instantly popular with many hunters. The 6.5 Grendel is a newer cartridge, just released in 2003 specifically to respond to demand for a cartridge that improved the AR-15’s applications in hunting.

The following ballistics tables show a side by side comparison of the 6.5 Grendel vs .308 Winchester based on bullet weight and various performance metrics including velocity, energy, usage and recoil.

6.5 grendel 123 gr vs .308 win 125 gr Cartridge Comparison Table.

6.5 Grendel .308 Winchester
Bullet Velocity (Muzzle) 2,580 ft/s 3,100 ft/s
Bullet Velocity @ 100 yds 2,410 ft/s 2,836 ft/s
Bullet Velocity @ 200 yds 2,246 ft/s 2,587 ft/s
Bullet Velocity @ 300 yds 2,088 ft/s 2,351 ft/s
Bullet Velocity @ 400 yds 1,937 ft/s 2,128 ft/s
Bullet Velocity @ 500 yds 1,791 ft/s 1,918 ft/s
Bullet Energy (Muzzle) 1,818 ft⋅lb 2,667 ft⋅lb
Bullet Energy @ 100 yds 1,585 ft⋅lb 2,232 ft⋅lb
Bullet Energy @ 200 yds 1,377 ft⋅lb 1,857 ft⋅lb
Bullet Energy @ 300 yds 1,191 ft⋅lb 1,534 ft⋅lb
Bullet Energy @ 400 yds 1,025 ft⋅lb 1,257 ft⋅lb
Bullet Energy @ 500 yds 876 ft⋅lb 1,021 ft⋅lb
Usage @ 0 yds Large Game Tougest Game
Usage @ 100 yds Large Game Tougest Game
Usage @ 200 yds Medium Game Large Game
Usage @ 300 yds Medium Game Large Game
Usage @ 400 yds Medium Game Medium Game
Usage @ 500 yds Medium Game Medium Game
Recoil Energy 7.0 9
Recoil Velocity 8 8.1
Recoil Score* 2.05 2.16
*Cartridge ballistics, usage and recoil figures takend from Sportsman's Warehouse rifle ballistics and rifle recoil tables. Recoil score based on weighted average of recoil energy and recoil velocity normalized between 1 and 10.

Velocity

The .308 Winchester has an advantage over the 6.5 Grendel in velocity, especially at shorter distances. Out of the muzzle, the .308 Winchester is shooting a whopping 520 ft/s faster than the 6.5 Grendel. However, this difference narrows pretty rapidly.

By the time we reach 500 yards, the .308 Winchester is shooting just 127 ft/s faster than the 6.5 Grendel. If you’ll be shooting at longer distances, the difference in velocity will not be as much of a factor between these two calibers as the difference in energy.

Energy

The .308 Winchester has significantly more capacity for powder than the 6.5 Grendel, as detailed below in the Size Comparison section. This translates to much more energy, which means better stopping power on game. Right out of the muzzle, the .308 Winchester is traveling with 849 ft-lbs more energy than the 6.5 Grendel. As we get out to 500 yards, that difference narrows, but the .308 Winchester still has 145 ft-lbs more energy than the 6.5 Grendel.

Trajectory

The increased energy means that the .308 Winchester also has less bullet drop and is less susceptible to wind drift than the 6.5 Grendel. With a 10 mph crosswind, you’ll see 33.4” of wind drift from the 6.5 Grendel, while you’ll only see 23.3” of wind drift from a comparably weighted .308 Winchester. This can make a significant difference if you will be hunting in windy conditions, and learning to correct for it is a big part of ensuring a clean, ethical kill.

Recoil

Recoil is often subjective, and felt recoil will vary by shooter and by rifle. However, looking at recoil energy and our recoil score, the 6.5 Grendel has a significant advantage over the .308 Winchester. The .308 can have double or even triple the recoil of the 6.5 Grendel, depending on the weight of the bullet. The .308 is still not viewed as a particularly intense recoil for a big game hunting cartridge – which goes to show how mild the 6.5 Grendel can be for these applications. Recoil can greatly impact your ability to shoot accurately, so it is an important consideration for hunters and target shooters.

Versatility

The 6.5 Grendel is a medium range round. It’s a great round for deer, and it’s a strong general-purpose option. This means that you’ll primarily be targeting medium game at medium distances, though the 6.5 Grendel can take some larger game at close ranges. The .308 Winchester has more applications: it can be used for long-range target shooting or big game hunting, and it’s been used in tactical settings as well. The .308 Winchester can take much more serious game than the 6.5 Grendel, including elk and bear – just about anything you can find in North America.

Price & Availability

The 6.5 Grendel has been gaining popularity in recent years, thanks to avid fans of the AR-15 who are looking to expand into deer and medium game hunting. However, it is still not quite the staple of the market that the .308 Winchester has been. As a consequence of this, there are fewer options available, and it is generally more expensive than the .308 Winchester. However, neither ammunition is particularly expensive or hard to find – this is just a matter of degree.

Handloaders will also find components for each caliber to be ready available, though the .308 is again more common. The .264” bullet of the 6.5 Grendel is shared by fairly popular cartridges such as the 6.5 Creedmoor and .260 Remington, but the .308” bullet of the .308 Winchester is shared by classic cartridges such as the .30-06 Springfield, .300 Win Mag, .300 PRC, and more.

Size Comparison

The .308 Winchester is quite a bit taller than the 6.5 Grendel. The Grendel was initially designed for the AR-15 platform, which keeps it under the AR’s maximum size. Because the .308 Winchester is a much longer bullet, it must be used in a larger rifle – which might be an issue if you are a backcountry hunter traveling over long distances. However, the increased size of the .308 Winchester does have an advantage in giving the .308 a much larger capacity: its factory loads come in 110-180 grains, while 6.5 Grendel is typically shot in the 90-130 grain range.

Rifle Type

The choice between purchasing a rifle chambered in the .308 Winchester and a rifle chambered in the 6.5 Grendel is often a choice between rifle platforms. The 6.5 Grendel was designed specifically as an AR-15 cartridge, and many shooters choose it because they are passionate devotees of the AR-15 and want to use it for big game hunting. The .308 Winchester is chambered in many different types of rifles, and usually requires a longer barrel to get the velocity necessary for a clean, ethical kill.

Which Caliber is Best?

The .308 Winchester is a more powerful cartridge, with higher energy, faster speed, and flatter trajectory. It can take down all game animals in North America, while it’s debated whether the 6.5 Grendel can take larger North American game such as elk and moose. However, if you’re looking for a big game hunting cartridge for the AR-15 platform, the 6.5 Grendel will do just fine at close distances, and provide a bit less recoil, too.

Disclaimer: Sportsman's Warehouse assumes no responsibility or liability for any errors or omissions of the information on this page. Although we strive to provide the most accurate information as we can the information contained in this page is provided on an "as is" basis with no guarantees of completeness, accuracy, usefulness or timeliness.