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Lindcott Armory

Rifle · SAAMI

8mm Remington Magnum

Also known as 8mm Rem Mag · 8x73mmRB

Powerful belted magnum pushing 8mm (.323") bullets at impressive velocity.

Caliber
0.323″ · 8.204 mm
Introduced
1978
Case
Belted
Parent
.375 H&H Magnum
Primary use
Hunting
Status
Active

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VelocityBeing verified
EnergyBeing verified
Typical grains185 · 200 · 220 gr
Identity
Introduced
1978
Type
Rifle
Origin
United States
Inventor
Remington
Manufacturer
Remington Arms
Standard
SAAMI
Status
Active
Availability
Limited
Build
Case capacity
106 gr H₂O
Twist (typical)
1:10
Primer
Large Rifle Magnum
Case type
Belted
Pressure & range
Max pressure
65,000 psi
Eff. range
400 yd
Max range
900 yd
Recoil
20–30 ft·lb

Introduced by Remington Arms

Ballistics

Published velocity/energy data isn't available for 8mm Remington Magnum. Parent case: .375 H&H Magnum.

Performance

Best for Withheld until verified
Best for Withheld until verified
Dimensionscase measurements · scale drawing · size vs familiar rounds

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

SAAMI · verified
Measuremmin✓
Bullet ⌀ 8.200.323 ✓
Neck ⌀ 9.020.355 ✓
Shoulder ⌀ 12.370.487 ✓
Shoulder angle 25°— ✓
Base ⌀ 13.020.513 ✓
Rim ⌀ 13.510.532 ✓
Belt ⌀ 13.510.532 ✓
Rim thickness 1.270.050 ✓
Neck length 8.120.320 ≈
Case length 72.392.850 ✓
Overall length 91.443.600 ✓

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. 8mm Remington Magnum is highlighted below.

Factory loads

Verification

Being verified

Advertised FPS, energy, and BC are withheld until loads clear verification.

Suitable powders

2 reloading powders listed for 8mm Remington Magnum, fastest to slowest. Cross-reference in the finder →

N170Reloader 25
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.

Lineage

Immediate parent
.375 H&H Magnum
Direct descendants (1)
7mm STW
Family TreeOpen 8mm Remington Magnum in the interactive cartridge family tree

Connected reference

Loads15 factory loads for 8mm Remington MagnumReloading2 suitable powders — cross-referenceFirearmsFirearms in 8mm Remington Magnum

History

Introduced by Remington in 1978 for the Model 700 BDL. The cartridge offered 8mm performance exceeding European standards and was aimed at elk and moose hunters wanting more power than .30 caliber magnums. Limited factory ammunition selection has constrained popularity, but handloaders appreciate the combination of the large case and quality 8mm bullets from European manufacturers.

FAQs

What twist rate does 8mm Remington Magnum use?
8mm Remington Magnum typically uses a 1:10 twist rate.
What bullet diameter is 8mm Remington Magnum?
8mm Remington Magnum uses a 0.323″ (8.204 mm) diameter bullet.
Is 8mm Remington Magnum still in production?
8mm Remington Magnum is active; typical availability is limited.
What is 8mm Remington Magnum used for?
8mm Remington Magnum is primarily used for hunting.
What is 8mm Remington Magnum based on?
8mm Remington Magnum is derived from the .375 H&H Magnum case.
What are the best powders for 8mm Remington Magnum?
Reloading powders commonly listed for 8mm Remington Magnum include N170, Reloader 25.

Sources & provenance

Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 15 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →