Lindcott Armory ReferenceGet the App
Jump toCartridge LibraryFactory LoadsPowder LibraryFirearm DatabaseBallistic Compare
ReferenceCartridge LibraryPowder LibraryFactory LoadsAmmo BrandsBullet CatalogBullet TypesBurn Rate ChartHeadstampsFirearm DatabaseDate Your GunToolsCartridge Family TreeBallistic CompareHead-to-HeadsAmmo Price HistoryField GuideOverviewHunting GuideMilitary TimelineGun HistoryBuying ChecklistStolen / Missing GunsAppsGet the App

Rifle · SAAMI

.284 Winchester

7mm Winchester7x51mm

Short-action 7mm cartridge with a rebated rim, fitting a .473" bolt face despite a larger .500" base.

Caliber
0.2839″ · 7.21 mm
Introduced
1963
Case
Rebated
Primary use
Hunting, Target, Competition
Status
Active
Velocity2,800–3,000 fps
Energy2,435–2,900 ft·lb
Typical grains140 · 150 · 168 gr
Identity
Introduced
1963
Type
Rifle
Origin
United States
Inventor
Winchester
Manufacturer
Winchester
Standard
SAAMI
Status
Active
Availability
Limited
Build
Case capacity
66 gr H₂O
Twist (typical)
1:10
Primer
Large Rifle
Case type
Rebated
Pressure & range
Max pressure
56,000 psi
Eff. range
500 yd
Max range
1200 yd
Recoil
12–16 ft·lb

Ballistics

Real trajectory computed from a representative load — HSM Trophy Gold 168 gr, 2,750 fps, BC 0.337 G7 · 100 yd zero.

overlay up to 2
RangeVelocityEnergyDrop (in)Drop (MOA)
0 yd27492819-1.5″—
100 yd261625530.0″0.0
200 yd24852304-3.6″-1.7
300 yd23592075-12.8″-4.1
400 yd22351864-28.3″-6.8
500 yd21161670-50.6″-9.7
600 yd20001491-80.9″-12.9
700 yd18861327-119.8″-16.3
800 yd17751176-168.5″-20.1

Point-mass G7/G1 drag model, standard atmosphere — within ~2% of reference solvers to 1000 yd; real barrels and conditions vary. Open in Ballistic Compare →

Performance

Best for HuntingHSM Trophy Gold168 gr · Berger VLD · 2,750 fps · BC 0.337 G7Buy now →

Buy links open .284 Winchester 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
Measuremmin✓
Bullet ⌀7.210.284✓
Neck ⌀8.130.320✓
Shoulder ⌀12.060.475✓
Shoulder angle35°—✓
Base ⌀12.720.501✓
Rim ⌀12.010.473✓
Belt ⌀n/a
Rim thickness1.370.054✓
Neck length7.240.285≈
Case length55.122.170✓
Overall length71.122.800✓

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. .284 Winchester is highlighted below.

Factory loads

In production — 17 active loads across 12 brands. Top 15 shown · see all 18 →.

BrandLoadGrainBulletFPSft·lbBC
HSMTrophy Gold168Berger VLD2,7502,8210.337 G7
BergerHunting168VLD Hunting2,7502,8210.337 G7
BarnesVOR-TX140TTSX BT2,9502,705—
BarnesTTSX140TSX-BT2,9002,614—
Sellier & BellotSP150SP2,8602,724—
WinchesterSuper-X Power-Point150Power Point SP2,8602,724—
FederalPremium Nosler Partition150Nosler Partition2,8602,724—
NoslerTrophy Grade AccuBond150AccuBond2,8602,724—
FederalPower-Shok150SP2,8602,724—
PPUSP150SP2,8602,724—
NoslerPartition150Partition2,8602,724—
WinchesterSuper-X150Power-Point2,8602,724—
SierraGameKing150SBT2,8602,724—
RemingtonCore-Lokt150SP2,8602,724—
HornadyInterLock150SP2,8602,724—

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

Suitable powders

5 reloading powders listed for .284 Winchester, fastest to slowest. Cross-reference in the finder →

Reloader 17Reloader 19H4831IMR 483120N29
Reloading costestimate cost per round vs factory

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

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

Firearms chambered in .284 Winchester

6 models in the database chamber .284 Winchester. Browse all →

American Rifle Company Mausingfield 308 WinSavage Arms Model 99CWinchester Repeating Arms Model 100 .284 Win 22-inchWinchester Repeating Arms Model 100 .308 Win 22-inchWinchester Repeating Arms Model 88 .308 Win 22-inchWinchester Model 88

Lineage

Immediate parent
Root — no documented parent
Direct descendants (6 · 9 total)
6.5-284 Norma.475 Wildey Magnum6mm-284.450 Bushmaster6.5mm Weatherby RPM
Family TreeOpen .284 Winchester in the interactive cartridge family tree↗

Connected reference

Loads18 factory loads for .284 Winchester↗Reloading5 suitable powders — cross-reference↗FirearmsFirearms in .284 Winchester↗ToolCompare ballistics↗

History

Introduced by Winchester in 1963 for the Model 88 lever-action and Model 100 semi-automatic. The rebated rim — smaller than the case body — was an unusual engineering choice that allowed the large-capacity case to fit standard bolt faces. Despite good ballistics, commercial success was limited: the 7mm Remington Magnum debuted the same year and captured the market. Reloaders rediscovered the .284 Winchester in the 1990s–2000s precision community for its superior powder capacity compared to .308 Winchester in short-action rifles.

FAQs

What twist rate does .284 Winchester use?
.284 Winchester typically uses a 1:10 twist rate.
What bullet diameter is .284 Winchester?
.284 Winchester uses a 0.2839″ (7.21 mm) diameter bullet.
Is .284 Winchester still in production?
.284 Winchester is active; typical availability is limited.
What is .284 Winchester used for?
.284 Winchester is primarily used for hunting, target, competition.
What are the best powders for .284 Winchester?
Reloading powders commonly listed for .284 Winchester include Reloader 17, Reloader 19, H4831, IMR 4831, among 5 suitable options.

Sources & provenance

Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 17 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →