6.5 Grendel, By the Numbers
6.5 Grendel was developed by Bill Alexander and Arne Brennan and introduced in 2003, and standardized by SAAMI in 2011, to give the AR-15 real reach with the high-BC 6.5 mm bullets that were already winning at long range in bolt guns. It is built on the .220 Russian / 7.62x39 case family, which is why it needs its own bolt with a .136″ bolt face and its own magazines, and why it went on to become the parent case for both 6mm ARC and 22 ARC. Designed around an 18 to 20″ barrel, it keeps 120 to 130 gr bullets supersonic well past 1,000 yards and hits harder at distance than anything else on a small-frame AR.
The 123 gr ELD Match leaves Hornady’s 24″ test barrel at 2,580 fps and still carries 876 ft-lb at 500 yards. The 18″ MATCH-X Target gives up very little to a 20″ while keeping the rifle balanced, and its mid-length gas system gives a soft, smooth impulse. The Type II chamber is the current industry standard and pairs with a Type II bolt, which is what nearly every Grendel bolt sold today is.
Hornady factory data — 6.5 Grendel 123 gr ELD Match, 24″ test barrel
| Range | Velocity | Energy | Drop (200 yd zero) |
| Muzzle | 2,580 fps | 1,818 ft-lb | — |
| 100 yd | 2,409 | 1,585 | +2.3″ |
| 200 yd | 2,244 | 1,376 | 0 |
| 300 yd | 2,086 | 1,189 | −9.2″ |
| 400 yd | 1,935 | 1,023 | −26.4″ |
| 500 yd | 1,791 | 876 | −52.8″ |
Source: Hornady published ballistics from a 24″ test barrel. Expect roughly 100–150 fps less from the 18″ MATCH-X Target.
What You Need to Build It
6.5 Grendel bolt (Type II, .136″ bolt face) and Grendel magazines; carrier, upper, buffer, and barrel nut are standard AR-15. .750″ gas block and a mid-length gas tube. Headspaced with a 6.5 Grendel go/no-go gauge.
What Every MATCH-X Barrel Shares
416-R stainless bar stock, drilled, reamed to 32 Ra, honed to 8 Ra before the rifling button goes through, 5R button rifled, stress relieved at 1150°F, contoured, chambered, then lapped back to a uniform 16 Ra from throat to crown. Bore and groove air-gauged at three points, honed finish read on a profilometer, borescoped, chamber verified on a CMM, magnetic-particle inspected, nickel-Teflon extension torqued to 150 ft-lb, pinned, and headspaced. Exterior left as bare stainless blasted with S110 media. Made in Greater Cincinnati, Ohio, backed by the Faxon Lifetime Guarantee. See the whole MATCH-X line and the process video ›
MATCH-X 6.5 Grendel FAQs
Do I need a special bolt for 6.5 Grendel?
Yes. 6.5 Grendel uses a larger case head than 5.56, so it needs a Grendel bolt with a .136″ bolt face and Grendel magazines. This barrel has a Type II chamber, which pairs with a Type II bolt, the current standard. A 5.56 bolt will not headspace.
What bullet weights does the 1:8 twist stabilize?
Everything the cartridge is loaded with, from 90 gr varmint bullets through the 120 to 130 gr match and hunting bullets that give Grendel its reputation at 600 yards and beyond.
Why 18 inches?
Grendel was designed around 18 to 20″. An 18″ barrel gives up very little to a 20″ while keeping the rifle balanced, and the mid-length gas system on this barrel gives it a soft impulse.
How does Grendel compare to 6mm ARC and 22 ARC?
All three share the bolt and magazines. Grendel carries the heaviest bullets and hits hardest; 6mm ARC is flatter with more bullet choices; 22 ARC is the fastest and flattest. Faxon makes MATCH-X barrels in all three.
