What twist rate does .408 CheyTac use?

.408 CheyTac typically uses a 1:13 twist rate.

What bullet diameter is .408 CheyTac?

.408 CheyTac uses a 0.4079″ (10.36 mm) diameter bullet.

Is .408 CheyTac still in production?

.408 CheyTac is active; typical availability is limited.

What is .408 CheyTac used for?

.408 CheyTac is primarily used for military, target.

What is .408 CheyTac based on?

.408 CheyTac is derived from the .400 Taylor Magnum case.

What are the best powders for .408 CheyTac?

Reloading powders commonly listed for .408 CheyTac include 24N41.

Rifle · Proprietary

.408 CheyTac

.408 CT10.3x77mm.408 Cheyenne Tactical

Ultra long-range precision cartridge.

Caliber: 0.4079″ · 10.36 mm
Introduced: 2001
Case: Rebated
Parent: .400 Taylor Magnum
Primary use: Military, Target
Status: Active

Velocity2,850–3,050 fps

Energy7,600–8,900 ft·lb

Typical grains395 · 400 · 419 gr

Identity

Introduced: 2001
Type: Rifle
Origin: United States
Inventor: Dr. John Taylor / William Wordman
Manufacturer: CheyTac LLC
Standard: Proprietary
Status: Active
Availability: Limited

Build

Case capacity: 245 gr H₂O
Twist (typical): 1:13
Primer: Large Rifle Magnum
Case type: Rebated

Pressure & range

Max pressure: 65,000 psi
Eff. range: 2200 yd
Max range: 6500 yd
Recoil: 55–75 ft·lb

Ballistics

Representative trajectory · 100 yd zero0–800 yd

Open in Ballistic Compare ↗

By real loads: 2,752–3,000 fps · 18 loads
Parent case: .400 Taylor Magnum

Representative trajectory — modeled from a single velocity input (no published BC for this cartridge yet).

Performance

Best for HuntingLehigh Defense Controlled Chaos400 gr · Controlled Chaos · 2,950 fpsBuy now →

Best for TargetHornady A-MAX Match400 gr · A-MAX · 3,000 fpsBuy now →

Buy links open .408 CheyTac ammunition at Rivertown Munitions.

Dimensionscase measurements · scale drawing · size vs familiar rounds

Case dimensions — the scale drawing at the top of the page is built from these.

CIP TDCC · verified

Measure	mm	in	✓
Bullet ⌀	10.36	0.408	✓
Neck ⌀	11.12	0.438	✓
Shoulder ⌀	15.24	0.600	✓
Shoulder angle	22.1°	—	✓
Base ⌀	16.18	0.637	✓
Rim ⌀	16.25	0.640	✓
Belt ⌀	n/a
Rim thickness	1.60	0.063	✓
Neck length	9.90	0.390	≈
Case length	77.21	3.040	✓
Overall length	115.50	4.547	✓

Size vs familiar rounds

Drawn at true 1:1 — every case is accurate relative to the others. Absolute size depends on your screen's pixel density, so measuring one against a real ruler may be off. .408 CheyTac is highlighted below.

Factory loads

In production — 18 active loads across 11 brands. Top 15 shown · see all 18 →.

Brand	Load	Grain	Bullet	FPS	ft·lb	BC
Hornady	A-MAX Match	400	A-MAX	3,000	7,992	—
Applied Ballistics	Match Solid	419	Match Solid	3,000	8,372	—
Barnes	Match Burner OTM	400	Match Burner OTM	3,000	7,992	—
Hornady	A-MAX Match	395	A-MAX	2,950	7,631	—
Lehigh Defense	Controlled Chaos	400	Controlled Chaos	2,950	7,728	—
CheyTac	CheyTac Match	419	FMJBT	2,900	7,823	—
Lapua	Lapua Scenar	419	FMJBT	2,900	7,823	—
Graf	FMJ Standard	419	FMJ	2,850	7,556	—
Applied Ballistics	Match Solid	419	Lathe Turned Solid	2,850	7,556	—
Lapua	Scenar	419	Hollow Point BT	2,850	7,556	—
CheyTac	M3 FMJ Match	419	FMJ	2,850	7,556	—
Berger	Hybrid	419	Hybrid Target	2,850	7,556	—
Lehigh Defense	Custom	419	Solid Copper	2,850	7,556	—
Sierra	MatchKing	419	Hollow Point BT	2,850	7,556	—
Hornady	A-MAX	419	A-MAX	2,850	7,556	—

Velocities are manufacturer-stated (test-barrel). Discontinued loads dimmed.

Suitable powders

1 reloading powder listed for .408 CheyTac, fastest to slowest. Cross-reference in the finder →

24N41

Reloading costestimate cost per round vs factory

Estimate your cost per round and how it compares to factory. Inputs are yours — nothing is stored.

Powder $/lbCharge (gr)Bullet $/eaPrimer $/eaBrass reusesBrass $/ea

Cost estimate only — not load data. Charge weight is your input; follow published manuals for safe charges.

Firearms chambered in .408 CheyTac

12 models in the database chamber .408 CheyTac. Browse all →

Cadex Defence CDX-40 ShadowAccuracy International AXSR 375 CheyTacCadex Defence CDX-40 Shadow .375 CheyTac 30-inchDesert Tech HTI .375 CheyTacDesert Tech HTICadex Defence Cadex Defence CDX-40 .375 CheyTac 29-inchCheyTac M200A2CheyTac M310CheyTac M200 375 CheyTacCheyTac M200 Intervention 408 CheyTacCheyTac CheyTac M200 Intervention .408 CheyTac 29-inchCheyTac M200 Intervention

Lineage

Immediate parent

.400 Taylor Magnum · derived during development from

Direct descendants (2)

.375 CheyTac .375 SnipeTac

Family TreeOpen .408 CheyTac in the interactive cartridge family tree↗

Connected reference

Loads18 factory loads for .408 CheyTac↗Reloading1 suitable powder — cross-reference↗FirearmsFirearms in .408 CheyTac↗ToolCompare ballistics↗

History

Developed in 2001 by CheyTac Associates for extreme long-range precision shooting. Part of complete Intervention weapon system including rifle, ammunition, and ballistic computer. Specifically designed for consistent accuracy beyond 2,000 yards. The .408 diameter was chosen for optimal balance of BC, sectional density, and manageable recoil. Used for extreme long-range military sniping and competition.

FAQs

What twist rate does .408 CheyTac use?: .408 CheyTac typically uses a 1:13 twist rate.
What bullet diameter is .408 CheyTac?: .408 CheyTac uses a 0.4079″ (10.36 mm) diameter bullet.
Is .408 CheyTac still in production?: .408 CheyTac is active; typical availability is limited.
What is .408 CheyTac used for?: .408 CheyTac is primarily used for military, target.
What is .408 CheyTac based on?: .408 CheyTac is derived from the .400 Taylor Magnum case.
What are the best powders for .408 CheyTac?: Reloading powders commonly listed for .408 CheyTac include 24N41.

Sources & provenance

Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 18 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →