Lindcott Armory Rifle · SAAMI
.270 Weatherby Magnum
The hypervelocity .270 — driving bullets at speeds Jack O'Connor's beloved .270 Winchester couldn't approach.
- Caliber
- 0.2773″ · 7.043 mm
- Introduced
- 1943
- Case
- Belted
- Parent
- .300 H&H Magnum
- Primary use
- Hunting, Long Range
- Status
- Active
- Introduced
- 1943
- Type
- Rifle
- Origin
- United States
- Inventor
- Roy Weatherby
- Manufacturer
- Weatherby
- Standard
- SAAMI
- Status
- Active
- Availability
- Common
- Case capacity
- 91 gr H₂O
- Twist (typical)
- 1:10
- Primer
- Large Rifle Magnum
- Case type
- Belted
- Max pressure
- 65,000 psi
- Eff. range
- 500 yd
- Max range
- 1500 yd
- Recoil
- 20–28 ft·lb
Ballistics
Real trajectory computed from a representative load — HSM Trophy Gold 150 gr, 3,200 fps, BC 0.278 G7 · 100 yd zero.
| Range | Velocity | Energy | Drop (in) | Drop (MOA) |
|---|---|---|---|---|
| 0 yd | 3199 | 3408 | -1.5″ | — |
| 100 yd | 3025 | 3048 | 0.0″ | 0.0 |
| 200 yd | 2855 | 2714 | -2.3″ | -1.1 |
| 300 yd | 2691 | 2411 | -8.9″ | -2.8 |
| 400 yd | 2531 | 2133 | -20.3″ | -4.8 |
| 500 yd | 2376 | 1879 | -37.1″ | -7.1 |
| 600 yd | 2227 | 1651 | -60.0″ | -9.6 |
| 700 yd | 2082 | 1444 | -90.1″ | -12.3 |
| 800 yd | 1942 | 1256 | -128.2″ | -15.3 |
| 900 yd | 1807 | 1087 | -175.4″ | -18.6 |
| 1000 yd | 1676 | 935 | -233.4″ | -22.3 |
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 .270 Weatherby 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.
SAAMI · approximate| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 7.04 | 0.277 | ✓ |
| Neck ⌀ | 7.75 | 0.305 | ✓ |
| Shoulder ⌀ | 12.50 | 0.492 | ✓ |
| Shoulder angle | — | — | |
| Base ⌀ | 13.00 | 0.512 | ✓ |
| Rim ⌀ | 13.50 | 0.531 | ✓ |
| Belt ⌀ | 13.51 | 0.532 | ✓ |
| Rim thickness | 1.30 | 0.051 | ✓ |
| Neck length | 8.33 | 0.328 | ≈ |
| Case length | 64.74 | 2.549 | ✓ |
| Overall length | 83.69 | 3.295 | ✓ |
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. .270 Weatherby Magnum is highlighted below.
Missing a dimension for .270 Weatherby Magnum? Some case measurements aren't in a published SAAMI/CIP drawing yet. Have a factory or reamer print? Send it → — verified hard-to-find data earns a free Lindcott sticker.
Factory loads
In production — 22 active loads across 10 brands. Top 15 shown · see all 22 →.
| Brand | Load | Grain | Bullet | FPS | ft·lb | BC |
|---|---|---|---|---|---|---|
| Barnes | VOR-TX TTSX BT | 130 | TTSX BT | 3,375 | 3,287 | 0.190 G7 |
| Weatherby | Select Plus | 130 | Nosler Ballistic Tip | 3,375 | 3,287 | 0.221 G7 |
| Weatherby | Select Plus Nosler AccuBond | 130 | Nosler AccuBond | 3,375 | 3,287 | 0.230 G7 |
| Weatherby | Select Plus | 130 | Nosler Partition | 3,375 | 3,287 | 0.416 G1 |
| Weatherby | Select Plus | 140 | Hornady ELD-X | 3,300 | 3,385 | 0.274 G7 |
| Hornady | Precision Hunter ELD-X | 145 | ELD-X | 3,300 | 3,506 | 0.274 G7 |
| Hornady | Precision Hunter | 145 | ELD-X | 3,250 | 3,400 | 0.274 G7 |
| Weatherby | Select Plus | 140 | AccuBond CT | 3,250 | 3,283 | 0.272 G7 |
| Weatherby | Select Plus | 150 | Nosler Partition | 3,245 | 3,507 | 0.456 G1 |
| HSM | Trophy Gold | 150 | Berger VLD | 3,200 | 3,410 | 0.278 G7 |
| Norma | Oryx | 130 | Oryx | 3,375 | 3,287 | — |
| Black Hills | Gold | 130 | TSX | 3,375 | 3,287 | — |
| Winchester | Power Point | 130 | Power Point | 3,375 | 3,287 | — |
| Federal | Terminal Ascent | 136 | Terminal Ascent | 3,300 | 3,288 | — |
| Barnes | VOR-TX | 140 | TTSX BT | 3,250 | 3,283 | — |
Velocities are manufacturer-stated (test-barrel). Discontinued loads dimmed.
Suitable powders
2 reloading powders listed for .270 Weatherby 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 .270 Weatherby Magnum
12 models in the database chamber .270 Weatherby Magnum. Browse all →
Lineage
ⓘ Direct parent is .300 H&H (shortened, blown-out, necked to .277); .375 H&H is the grandparent since .300 H&H itself derives from it.
Connected reference
History
One of Weatherby's original cartridges. The great gun writer Jack O'Connor championed the standard .270 Winchester; Weatherby's magnum version outperformed it by 400-500 fps. Their philosophical battle — O'Connor favoring light loads, Weatherby favoring maximum velocity — defined American hunting cartridge debate for 30 years.
FAQs
- What twist rate does .270 Weatherby Magnum use?
- .270 Weatherby Magnum typically uses a 1:10 twist rate.
- What bullet diameter is .270 Weatherby Magnum?
- .270 Weatherby Magnum uses a 0.2773″ (7.043 mm) diameter bullet.
- Is .270 Weatherby Magnum still in production?
- .270 Weatherby Magnum is active; typical availability is common.
- What is .270 Weatherby Magnum used for?
- .270 Weatherby Magnum is primarily used for hunting, long range.
- What is .270 Weatherby Magnum based on?
- .270 Weatherby Magnum is derived from the .375 H&H Magnum case.
- What are the best powders for .270 Weatherby Magnum?
- Reloading powders commonly listed for .270 Weatherby Magnum include N170, Reloader 25.
Sources & provenance
- StandardSAAMI — SAAMI cartridge & chamber drawing — .270 Weatherby Magnum
- StandardSAAMI — ANSI/SAAMI Z299 — Cartridge & Chamber Drawingsarchived
- Secondary.270 Weatherby Magnum — Wikipedia (pointer to cited Weatherby/H&H sourcing) · parent_cartridge
- SecondaryHead to Head / Behind the Bullet Weatherby coverage — American Hunter (NRA) · parent_cartridge
- Secondary.270 Wby. Mag.: The Original Weatherby — American Rifleman (NRA) · parent_cartridge
Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 22 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →