Lindcott Armory Rifle · SAAMI
.300 H&H Magnum
The grandfather of all belted magnums.
- Caliber
- 0.3079″ · 7.82 mm
- Introduced
- 1925
- Case
- Belted
- Parent
- .375 H&H Magnum
- Primary use
- Hunting, Big Game
- Status
- Active
- Introduced
- 1925
- Type
- Rifle
- Origin
- United Kingdom
- Inventor
- Holland & Holland
- Manufacturer
- Holland & Holland
- Standard
- SAAMI
- Status
- Active
- Availability
- Common
- Case capacity
- 95 gr H₂O
- Twist (typical)
- 1:10
- Primer
- Large Rifle Magnum
- Case type
- Belted
- Max pressure
- 58,000 psi
- Eff. range
- 600 yd
- Max range
- 1500 yd
- Recoil
- 25–35 ft·lb
Ballistics
Real trajectory computed from a representative load — Nosler Trophy Grade AccuBond 180 gr, 2,880 fps, BC 0.259 G7 · 100 yd zero.
| Range | Velocity | Energy | Drop (in) | Drop (MOA) |
|---|---|---|---|---|
| 0 yd | 2879 | 3313 | -1.5″ | — |
| 100 yd | 2702 | 2918 | 0.0″ | 0.0 |
| 200 yd | 2531 | 2559 | -3.3″ | -1.6 |
| 300 yd | 2365 | 2235 | -11.9″ | -3.8 |
| 400 yd | 2205 | 1943 | -26.9″ | -6.4 |
| 500 yd | 2051 | 1681 | -49.0″ | -9.4 |
| 600 yd | 1902 | 1446 | -79.4″ | -12.6 |
| 700 yd | 1758 | 1235 | -119.3″ | -16.3 |
| 800 yd | 1619 | 1047 | -170.7″ | -20.4 |
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
Buy links open .300 H&H Magnum 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 ⌀ | 7.82 | 0.308 | ✓ |
| Neck ⌀ | 8.59 | 0.338 | ✓ |
| Shoulder ⌀ | 11.43 | 0.450 | ✓ |
| Shoulder angle | 8.5° | — | ✓ |
| Base ⌀ | 13.03 | 0.513 | ✓ |
| Rim ⌀ | 13.51 | 0.532 | ✓ |
| Belt ⌀ | 13.56 | 0.534 | ~ |
| Rim thickness | 1.27 | 0.050 | ✓ |
| Neck length | 9.43 | 0.371 | ≈ |
| Case length | 72.39 | 2.850 | ✓ |
| Overall length | 91.44 | 3.600 | ✓ |
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. .300 H&H Magnum is highlighted below.
Factory loads
In production — 14 active loads across 9 brands. Top 15 shown · see all 19 →.
| Brand | Load | Grain | Bullet | FPS | ft·lb | BC |
|---|---|---|---|---|---|---|
| Barnes | VOR-TX | 180 | TTSX BT | 2,880 | 3,315 | 0.235 G7 |
| Nosler | Trophy Grade AccuBond | 180 | AccuBond | 2,880 | 3,315 | 0.259 G7 |
| Norma | Oryx | 180 | Bonded SP | 2,880 | 3,315 | — |
| Hornady | Custom | 180 | InterLock SP | 2,880 | 3,315 | — |
| Winchester | Super-X Power-Point | 180 | Power Point SP | 2,880 | 3,315 | — |
| Federal | Premium Nosler Partition | 180 | Nosler Partition | 2,880 | 3,315 | — |
| Sellier & Bellot | SP | 180 | SP | 2,880 | 3,315 | — |
| Hornady | Custom | 180 | SP | 2,880 | 3,315 | — |
| HSM | Trophy Gold | 180 | Berger | 2,880 | 3,315 | — |
| Remington | Core-Lokt | 180 | Core-Lokt | 2,880 | 3,315 | — |
| Federal | Trophy Bonded | 180 | Trophy Bonded | 2,880 | 3,315 | — |
| Hornady | Custom | 200 | BTSP | 2,740 | 3,333 | — |
| Federal | Power-Shok | 200 | Power-Shok SP | 2,740 | 3,333 | — |
| Remington | Core-Lokt | 220 | Core-Lokt | 2,550 | 3,176 | — |
| Western | Super-X | 180 | SP | 2,920 | 3,407 | — |
Velocities are manufacturer-stated (test-barrel). Discontinued loads dimmed.
Suitable powders
7 reloading powders listed for .300 H&H Magnum, fastest to slowest. Cross-reference in the finder →
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 .300 H&H Magnum
12 models in the database chamber .300 H&H Magnum. Browse all →
Lineage
Connected reference
History
Holland & Holland introduced it in 1925 as the 'Super .30.' Won the 1935 Wimbledon Cup — America's premier long-range rifle match — fired by American Ben Comfort in a Mauser action. This victory introduced American shooters to the belted magnum concept. Winchester commercialized it in 1925. The belt was originally a headspacing device for double rifles.
FAQs
- What twist rate does .300 H&H Magnum use?
- .300 H&H Magnum typically uses a 1:10 twist rate.
- What bullet diameter is .300 H&H Magnum?
- .300 H&H Magnum uses a 0.3079″ (7.82 mm) diameter bullet.
- Is .300 H&H Magnum still in production?
- .300 H&H Magnum is active; typical availability is common.
- What is .300 H&H Magnum used for?
- .300 H&H Magnum is primarily used for hunting, big game.
- What is .300 H&H Magnum based on?
- .300 H&H Magnum is derived from the .375 H&H Magnum case.
- What are the best powders for .300 H&H Magnum?
- Reloading powders commonly listed for .300 H&H Magnum include Reloader 19, H4831, IMR 4831, MRP2, among 7 suitable options.
Sources & provenance
- StandardSAAMI — SAAMI cartridge & chamber drawing — .300 H&H Magnumarchived
- StandardC.I.P. — C.I.P. TDCC — Tables of Dimensions of Cartridges and Chambers
Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 14 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →