Head to head

6mm ARC vs 6.5 Grendel: Maker-Page Loads and SAAMI Specs Side by Side

By Cole Harlan, EditorUpdated Nov 5, 2026How we verifyEditorial standards

This page puts 6mm ARC and 6.5 Grendel side by side using only our own ammo guides, 6mm ARC ammo (9 loads) and 6.5 Grendel ammo (12 loads), plus the cartridge specs SAAMI publishes in ANSI/SAAMI Z299.4, its centerfire rifle standard. The guides copy bullet weights, velocities, energies and test barrels from maker product pages (checked Nov. 4, 2026). We don’t rate or rank cartridges, and we don’t subtract one maker’s velocity from another’s, because their test barrels differ.

How to read this page: every number is copied from a maker page or from SAAMI, and a test barrel length sits next to every velocity (or says the maker lists none). A dash (—) means the maker has no load in our tables for that cartridge. Fire only the cartridge your rifle’s maker says it is chambered for.

SAAMI specs side by side

These are the figures in ANSI/SAAMI Z299.4 (approved Feb. 10, 2025), as already recorded in the SAAMI sections of our 6mm ARC and 6.5 Grendel guides. Pressures are as SAAMI lists them.

Measure	6mm ARC	6.5 Grendel
SAAMI name	6MM ADVANCED RIFLE CARTRIDGE [6MM ARC]	6.5 GRENDEL [6.5 GREN]
Drawing issued / revised	01/20/2020 / 11/17/2021	01/17/2011 / 11/18/2021
Maximum average pressure (transducer)	52,000 psi	52,000 psi
Crusher pressure	Not established	Not established
Cartridge overall length	2.135 in min to 2.260 in max	2.135 in min to 2.260 in max
Case length	1.490 in (−.020)	1.520 in (−.020)
Bullet diameter (as SAAMI prints it)	.2433 in (−.0030)	.2643 in (−.0030)
Bore / groove diameter	.237 in / .243 in	.256 in / .264 in
Twist and grooves	1 in 7, 6 grooves	1 in 8, 6 grooves
SAAMI reference velocity	2,700 fps for a 108 gr bullet and 3,200 fps for 87 gr	Not yet verified (the PDF text does not clearly pair each weight with its velocity)
SAAMI velocity test barrel	24.000 in (±.010) with 6 grooves and a 1:7.50 twist (SAAMI velocity and pressure test barrel)	24 in standard rifle test barrel (SAAMI’s general statement; not among its listed exceptions)

Load ranges by maker and test barrel

Each line groups one maker’s loads that share a test barrel, so a velocity is only ever shown with the barrel it was measured in. Ranges are bullet weight and muzzle velocity as the maker page prints them. Do not read across makers: their barrels and bullets differ. For how barrel length moves velocity, see our barrel length vs velocity data.

Maker	6mm ARC loads in our table	6.5 Grendel loads in our table
Federal	test barrel not listed: 2 loads, 108 to 110 gr, 2,550 to 2,650 fps	test barrel not listed: 3 loads, 90 to 120 gr, 2,600 to 3,000 fps
Hornady	14.5 in test barrel: 1 load, 108 gr, 2,325 fps 24 in test barrel: 6 loads, 80 to 108 gr, 2,700 to 3,020 fps	24 in test barrel: 4 loads, 90 to 123 gr, 2,580 to 2,910 fps
Remington	—	test barrel not listed: 1 load, 130 gr, 2,400 fps
Nosler	—	24 in test barrel: 4 loads, 90 to 129 gr, 2,350 to 2,800 fps

Same maker, same line, both cartridges

Where one maker sells the same product line in both cartridges, the loads are listed side by side exactly as the maker pages print them. We match lines by the maker’s own product-line name in our guide tables. Compare only within a row, and check the test barrel in each cell.

Maker line	6mm ARC	6.5 Grendel
Federal American Eagle Rifle	110 gr Total Metal Jacket, 2,550 fps, 1,588 ft-lb, test barrel not listed, item AE6ARC1	120 gr Open Tip Match, 2,610 fps, 1,815 ft-lb, test barrel not listed, item AE65GDL1
Hornady V-Match	80 gr ELD-VT™ V-Match™, 3,020 fps, 1,620 ft-lb, 24 in test barrel, item 81603	100 gr ELD-VT™ V-Match™, 2,730 fps, 1,655 ft-lb, 24 in test barrel, item 81521

What the sources say when you choose

These are points taken from the figures above, each with the page it rests on. They are not recommendations or scores.

If pressure rating is your question: SAAMI lists a maximum average pressure of 52,000 psi by transducer for 6mm ARC and 52,000 psi by transducer for 6.5 Grendel, with no crusher pressure established where none is shown. Source: ANSI/SAAMI Z299.4.
If bullet weight is your question: the 6mm ARC loads in our table run from 80 gr (Hornady V-Match 81603) to 110 gr (Federal American Eagle Rifle AE6ARC1). The 6.5 Grendel loads run from 90 gr (Federal Varmint & Predator AE65GDL90VP) to 130 gr (Remington Premier Match 21205). Sources: those maker pages.
If you want to see the printed velocities: the slowest and fastest 6mm ARC muzzle velocities in our table are 2,325 fps, 14.5 in test barrel (Hornady Match SBR Suppressor 81614) and 3,020 fps, 24 in test barrel (Hornady V-Match 81603). For 6.5 Grendel they are 2,350 fps, 24 in test barrel (Nosler Trophy Grade AccuBond Long Range 60146) and 3,000 fps, test barrel not listed (Federal Varmint & Predator AE65GDL90VP). These come from different barrels and bullets, so we show them side by side without subtracting.
If you are comparing against a box or a chronograph: SAAMI says all standard rifle test barrels are 24 in long, and neither cartridge is on its list of exceptions. Many maker pages list a different barrel or none, as the tables above show. A shorter barrel than the one a maker lists will likely give lower velocities than the box; see our barrel length vs velocity data. Source: ANSI/SAAMI Z299.4 and the maker pages linked above.
If chamber fit is your question: SAAMI publishes a separate cartridge drawing for each, with case length 1.490 in (−.020) for 6mm ARC and 1.520 in (−.020) for 6.5 Grendel, and cartridge overall length 2.135 in min to 2.260 in max and 2.135 in min to 2.260 in max. Check the cartridge named in your rifle’s manual or marked on its barrel. Source: ANSI/SAAMI Z299.4.

Not yet verified

SAAMI reference velocities for 6.5 Grendel are not recorded in our guide because the PDF text does not clearly pair each weight with its velocity.
Winchester, Nosler and SIG Sauer 6mm ARC loads are not in the 6mm ARC guide’s table.
A dash in the range table means the maker has no load in that guide’s table, not that the maker sells none.
Prices, recoil, accuracy and hands-on results are not in our data, so this page says nothing about them.

See the full tables in our 6mm ARC ammo and 6.5 Grendel ammo, the barrel length vs velocity data, 6.5 Grendel vs 6.5 Creedmoor, .22 Creedmoor vs .22 ARC, the new ammo of 2026, all ammo releases and all comparisons.

Frequently asked questions

What is the SAAMI maximum pressure for 6mm ARC and 6.5 Grendel?

SAAMI lists 52,000 psi (transducer) for 6mm ARC, and 52,000 psi (transducer) for 6.5 Grendel, in ANSI/SAAMI Z299.4.

Which test barrel do the makers list?

It varies by maker and load. SAAMI says standard rifle test barrels are 24 in. Our tables show the barrel each maker page lists next to every velocity, and many pages list none.

Which is better, 6mm ARC or 6.5 Grendel?

We don't rate or rank cartridges. This page copies maker-page figures and SAAMI specs side by side, and it does not cover price, recoil or hands-on results.

Where do these numbers come from?

From our own ammo guides (6mm ARC ammo and 6.5 Grendel ammo), which copy maker product pages, and from ANSI/SAAMI Z299.4.

SAAMI specs side by side

Load ranges by maker and test barrel

Same maker, same line, both cartridges

What the sources say when you choose

Not yet verified

Related guides

Frequently asked questions

Sources

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