01 / At a glance
The basics
- Origin
- United States
- Introduced
- 2003
- Ignition
- Centerfire
- Case form
- Rimless, bottleneck
- Diameter
- 6.7 mm
- Case length
- 38.7 mm
Rounded values to help you identify the cartridge, not manufacturing drawings. See the cited standard for exact dimensions and tolerances.
Do not mix it up
The cartridge needs a magazine and bolt made for it. A standard 5.56 magazine will not feed it. Use only the cartridge the rifle is marked for.
The 6.5mm Grendel is a rimless 6.5 mm rifle cartridge made so that an AR-15 pattern rifle can shoot heavy, high-ballistic-coefficient bullets with enough speed to reach several hundred yards. It was unveiled in 2003 and has become one of the main alternatives to the 5.56 NATO for shooters who want more reach and more wind performance from the same size of rifle.
This guide explains what the 6.5 Grendel is, how it performs out to 500 yards, how to choose ammunition and a rifle, and how it compares with the 5.56 NATO, the 6.8 SPC, the .300 Blackout and the 6.5 Creedmoor. It is a reference page, not a loading manual, and it contains no loading data.
A short history
Bill Alexander and Janne Pohjoispää designed the cartridge, and it was unveiled in May 2003 at the Blackwater training facility in North Carolina. Competitive shooter Arne Brennan is also credited in its development. The case is based on the .220 Russian, a small, fat case that fits the AR-15 bolt face and magazine when it is set up for the cartridge.
The idea was to put a 6.5 mm bullet, which has a good sectional density and a high ballistic coefficient for its weight, into a case that fits the standard AR-15 size. The cartridge is 1.52 inches (38.7 mm) long in the case, with an overall length of 2.26 inches (57.5 mm), a bullet diameter of .264 inch and a maximum pressure of 52,000 psi. It uses a small rifle primer, and twist rates of 1 in 8 inches and 1 in 9 inches are in use.
Hornady worked with the makers on SAAMI standardization. The cartridge has since spread beyond the AR-15. Bolt-action rifles are made for it, and in Serbia the Zastava M19 and M20 Kalashnikov-pattern rifles are chambered for it. A light machine gun prototype based on the Zastava M84 has been tested, and SwissP Defence has partnered with the French GIGN unit on the cartridge.
Why people shoot it
The first reason is the bullet. A 6.5 mm bullet is slim and long for its weight, so it keeps its speed and resists wind better than a .224 or a 7.62x39 bullet at the same distance. A 123 grain bullet leaves at about 2,580 ft/s and still carries about 880 foot-pounds at 500 yards in this guide, which is more than a 5.56 carries at 300.
The second reason is the platform. The cartridge fits an AR-15 size rifle, so a shooter keeps the same controls, optics and accessories. Lighter bullets reach 3,000 ft/s, with a 90 grain load leaving at about that speed in factory ammunition, and heavier match bullets of 123 to 144 grains are favored by long-range shooters.
The third reason is range. Published 24 inch barrel data for Lapua loads show the 108 grain Scenar at about 1,166 ft/s at 1,000 meters and the 123 grain Scenar at about 1,222 ft/s. That is a long way for an AR-15 size cartridge, and it is why the Grendel shows up in long-range and F-Class style shooting.
Specifications at a glance
| Specification | Value |
|---|---|
| Bullet diameter | .264 in (6.71 mm) |
| Case length | 1.52 in (38.7 mm) |
| Overall length | 2.26 in (57.5 mm) |
| Case type | Rimless, bottleneck |
| Parent case | .220 Russian (5.6x39mm) |
| Primer | Small rifle |
| Maximum pressure | 52,000 psi (360 MPa) |
| Rifling twist | 1 in 8 in or 1 in 9 in |
| Typical bullet weights | 90 to 144 grains |
| Typical muzzle velocity | About 2,580 ft/s with a 123 grain bullet |
Values are rounded for reference. Exact dimensions and tolerances are in the SAAMI standard. Published sources give the bullet weight range as 90 to 129 grains in some places and up to 144 grains in others.
Strengths and limits
The 6.5 Grendel is a flat-shooting medium cartridge for the AR-15. These are the trade-offs to understand.
| Strength | Limit |
|---|---|
| Good wind performance and long reach for the size | Fewer rifles, magazines and ammunition than the 5.56 |
| Works in an AR-15 size rifle | Needs a barrel, bolt and magazines made for it |
| Moderate recoil | Lower velocity than larger 6.5 cartridges |
| Wide bullet choice at 6.5 mm | Magazine capacity is smaller than for the 5.56 |
Honest advice: if your shots stay inside 300 yards, a 5.56 or a .300 Blackout is cheaper and easier to feed. The 6.5 Grendel makes sense for shooters who want a semi-automatic rifle that reaches 500 to 800 yards, or a hunting rifle with a flat trajectory and moderate recoil.
Feeding
The case is wider than a 5.56 and needs a magazine and a bolt made for the cartridge. A standard 5.56 magazine may not feed it reliably. Use magazines from the rifle maker or from a maker who states they are for the Grendel, and test them before you depend on them.
Ballistics
The table and charts below show one factory load, a Hornady Black 123 grain ELD Match at 2,580 ft/s from a 24 inch test barrel, with the rifle zeroed at 200 yards. It is a match bullet with a high ballistic coefficient.
| Range (yd) | Velocity (ft/s) | Energy (ft-lb) | Drop (in) | Wind drift, 10 mph (in) |
|---|---|---|---|---|
| 100 | 2410 | 1586 | 2.2 | 0.7 |
| 200 | 2247 | 1379 | 0 | 2.9 |
| 300 | 2090 | 1192 | -9.1 | 6.8 |
| 400 | 1939 | 1027 | -26.3 | 12.6 |
| 500 | 1795 | 880 | -52.6 | 20.4 |
Reading the numbers
With a 200 yard zero the bullet rises about 2 inches above the line of sight at 100 yards, returns to the line at 200 and falls about 9 inches at 300, 26 at 400 and 53 at 500. A 10 mph crosswind moves it about 7 inches at 300 yards, 13 at 400 and 20 at 500. Velocity drops from 2,580 ft/s at the muzzle to about 1,800 ft/s at 500 yards, and energy from about 1,820 to about 880 foot-pounds.
The drop past 400 yards is steep, so the cartridge is a medium-range one for hunting. Target shooters use it farther with a known drop table and with the bullet still above the speed of sound. A rifle with a shorter barrel gives less velocity than the 24 inch test barrel.
How these figures were made: the muzzle velocity (2,580 ft/s), weight (123 grains) and the velocities at 100, 200, 300 and 500 yards (2,410, 2,247, 2,090 and 1,796 ft/s) are from published factory data for Hornady Black 123 grain ELD Match, from a 24 inch test barrel, as listed by a retailer and by a third-party chart. The ballistic coefficient (G1 0.519) was fitted to match those velocities. Hornady does not publish a numeric BC for this load in the sources used. Drop, velocity, energy and wind drift are calculated with a standard point-mass model, a 200 yard zero, a sight height of 1.5 inches and standard atmosphere. They are estimates. Your rifle and conditions will differ.
Recoil and shooter comfort
Recoil is light to moderate. In an AR-15 of 7 to 9 pounds, the 6.5 Grendel kicks more than a 5.56 and less than a .308 Winchester, and the gas action of a semi-automatic softens it further. Most adults, and many young shooters, shoot it well.
The report from a short barrel is sharp. Use good hearing protection, and consider both plugs and muffs. A muzzle device can reduce recoil and flash while raising the noise for people nearby.
How to choose ammunition
Hornady, Federal, Lapua, Norma, Sierra and Speer all appear in published load data, and Prvi Partizan makes ammunition for the cartridge. Match the bullet to the job, and test the load in your own rifle.
| Load | Muzzle velocity | Best for | Notes |
|---|---|---|---|
| 90 grain Speer TNT | About 2,880 ft/s | Varmints and predators | Light, fast bullet |
| 108 grain Lapua Scenar | About 2,790 ft/s | Target shooting | Match bullet; also 2,700 ft/s from a 24 inch barrel |
| 123 grain Sierra MatchKing | About 2,650 ft/s | Target and long-range practice | Common match weight |
| 123 grain ELD Match | About 2,580 ft/s | Target and hunting | Hornady Black; used for the figures in this guide |
| 130 grain Norma | About 2,510 ft/s | Hunting and target | Heavier bullet |
For hunting, choose a bullet made to expand reliably at the speeds the cartridge produces. Match bullets are made for target use and may not expand well on game. Try more than one load, since a rifle often prefers one.
Check the headstamp and the rifle
Do not put 6.5 Grendel ammunition in a rifle of another chambering, and do not confuse it with the 6.5 Creedmoor or the 6.5 PRC. Always read the barrel marking and the headstamp.
Cost
Factory ammunition costs more than for 5.56, and stores stock fewer choices. Plan your practice with that in mind. Many shooters reload to lower the cost, using only data from a current published manual.
How to choose a rifle
The right rifle depends on how you plan to use it. These are the points that matter most.
- Chambering and parts. Buy a rifle made for the 6.5 Grendel. The barrel, bolt and magazines must be made for it.
- Action type. AR-15 pattern rifles are the most common, and bolt-action rifles are made for the cartridge too.
- Barrel length. 16 to 20 inches is common for hunting and 20 to 24 inches for target use. Longer barrels give more velocity.
- Twist rate. 1 in 8 inches is common and suits the heavier bullets. 1 in 9 inches is also in use. Match the twist to the bullets you plan to shoot.
- Weight. A lighter rifle is easier to carry. A heavier barrel stays steadier in long strings.
- Trigger. A clean, crisp trigger improves accuracy at long range.
- Optic. A good variable-power scope with reliable adjustments suits the cartridge, and a ballistic reticle helps beyond 300 yards.
Many makers have offered rifles in the chambering, including AR-15 pattern rifles, bolt-actions and the Serbian Zastava M19 and M20. Not every model is still in production, so check current catalogs.
Zeroing and range practice
A 200 yard zero is a good starting point for hunting with this cartridge. With a 123 grain ELD Match the bullet rises about 2 inches at 100 yards and drops about 9 inches at 300, so you can hold on the vital area out to about 250 yards, and hold over beyond that.
Zero at 100 yards on paper first, then confirm at 200. Shoot at 300, 400 and 500 to learn your own drops, and write them on a card. The numbers in this guide are estimates from a model, and your barrel, load and air density will move them. Wind is the main problem past 400 yards, so practice judging it.
Shoot from field positions as well as a bench. Practice at the distances you actually plan to take.
Practical uses
Deer and hogs
The 6.5 Grendel is used on deer and hogs at moderate range with a bullet made for hunting. Keep shots inside about 300 yards, and check local rules for caliber and energy.
Long-range target shooting
The Grendel is widely used in AR-15 style target rifles, where match bullets of 108 to 130 grains keep their speed. It has been used at 1,000 yards and beyond, with careful bullet choice.
Predators
It works on coyotes, especially with a light, fast bullet. The cost makes it a heavy choice for plinking.
Military and police interest
Serbia adopted the cartridge for its Zastava M19 and M20 rifles, and other units have tested it. That interest shows what the design was made to do, though it is a civilian sporting cartridge in most markets.
6.5 Grendel vs similar cartridges
The table compares the 6.5 Grendel with the cartridges it is usually weighed against. Figures are rounded and use SAAMI pressures, except where noted.
| Cartridge | Bullet diameter | Case length | Max pressure | Typical use |
|---|---|---|---|---|
| 6.5 Grendel | .264 in | 1.52 in | 52,000 psi | Long-range and hunting in an AR-15 |
| 5.56x45 NATO | .224 in | 1.760 in | 62,400 psi (NATO) | Military and sporting |
| 6.8 SPC | .277 in | 1.687 in | 55,000 psi | Deer and hogs in an AR-15 |
| .300 Blackout | .308 in | 1.368 in | 55,000 psi | Suppressed use and short-range hunting |
| 6.5 Creedmoor | .264 in | 1.920 in | 62,000 psi | Target and hunting |
Against the 5.56, the Grendel carries a heavier bullet, resists wind better and reaches farther, while the 5.56 is cheaper and has far more rifles and ammunition. Against the 6.8 SPC, it shoots flatter and the 6.8 SPC hits harder at moderate range. Against the .300 Blackout, it shoots farther and the .300 Blackout suits suppressed use. Against the 6.5 Creedmoor, it uses the same bullets at lower speed, with a smaller rifle.
Care and storage
Clean the bore after a day of shooting, and follow the barrel maker's advice on copper and carbon. Keep the bolt and the gas system clean, since a semi-automatic rifle needs it to cycle. Inspect the magazines, the action and the scope mounts for tightness. Store the rifle unloaded and locked, with the ammunition separate and away from children.
Safety and common mistakes
- Do not confuse the 6.5 Grendel with the 6.5 Creedmoor or the 6.5 PRC. Read the barrel marking and the headstamp.
- Do not put 6.5 Grendel ammunition in a 5.56 rifle, or the reverse.
- Treat every rifle as loaded. Keep your finger off the trigger until the sights are on the target.
- Know your target and what lies beyond it. A rifle bullet can travel more than a mile.
- Wear eye and ear protection.
- Check the bore for obstructions before you load.
- Use magazines made for the cartridge, and keep them in good condition.
- If you reload, use only published data from a current manual and start low. This page does not contain loading data.
- Store firearms and ammunition locked and apart, away from children.
Frequently asked questions
What is the 6.5 Grendel?
It is a 6.5 mm rifle cartridge designed by Bill Alexander and Janne Pohjoispää and unveiled in May 2003, made so an AR-15 can shoot heavy, high-BC bullets.
What is the maximum pressure of the 6.5 Grendel?
The maximum pressure is 52,000 psi (360 MPa).
What case is the 6.5 Grendel based on?
It is based on the .220 Russian case, also called the 5.6x39mm.
What twist rate does the 6.5 Grendel use?
Twist rates of 1 in 8 inches and 1 in 9 inches are in use. 1 in 8 inches suits heavier bullets.
Can I use a 5.56 magazine for the 6.5 Grendel?
A standard 5.56 magazine may not feed the cartridge reliably. Use magazines made for the Grendel and test them.
How far can you shoot a 6.5 Grendel?
Published data for 24 inch barrels show Lapua match loads near 1,200 ft/s at 1,000 meters. For hunting, keep shots to about 300 yards or less.
Is the 6.5 Grendel better than the 5.56?
It reaches farther and resists wind better with a heavier bullet. The 5.56 is cheaper and has far more rifles and ammunition.
Who uses the 6.5 Grendel?
It is used by hunters and target shooters. Serbia adopted it for the Zastava M19 and M20 rifles.
Sources
Sources reviewed · 29 October 2026