Lindcott Armory Rifle · SAAMI
.300 Winchester Magnum
Popular magnum for long-range shooting and large game hunting.
- Caliber
- 0.308″ · 7.823 mm
- Introduced
- 1963
- Case
- Belted
- Parent
- .375 H&H Magnum
- Primary use
- Hunting, Military, Target
- Status
- Active
- Introduced
- 1963
- Type
- Rifle
- Origin
- United States
- Inventor
- Winchester
- Manufacturer
- Winchester
- Standard
- SAAMI
- Status
- Active
- Availability
- Abundant
- Case capacity
- 93.8 gr H₂O
- Twist (typical)
- 1:10
- Primer
- Large Rifle Magnum
- Case type
- Belted
- Max pressure
- 64,000 psi
- Eff. range
- 1200 yd
- Max range
- 5000 yd
- Recoil
- 25–38 ft·lb
Ballistics
Real trajectory computed from a representative load — Berger Hunting VLD 230 gr, 2,800 fps, BC 0.380 G7 · 100 yd zero.
| Range | Velocity | Energy | Drop (in) | Drop (MOA) |
|---|---|---|---|---|
| 0 yd | 2799 | 4002 | -1.5″ | — |
| 100 yd | 2680 | 3667 | 0.0″ | 0.0 |
| 200 yd | 2563 | 3354 | -3.3″ | -1.6 |
| 300 yd | 2448 | 3061 | -12.0″ | -3.8 |
| 400 yd | 2336 | 2787 | -26.4″ | -6.3 |
| 500 yd | 2228 | 2534 | -47.2″ | -9.0 |
| 600 yd | 2122 | 2298 | -75.0″ | -11.9 |
| 700 yd | 2018 | 2079 | -110.6″ | -15.1 |
| 800 yd | 1917 | 1876 | -154.7″ | -18.5 |
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 Winchester 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 ⌀ | 8.63 | 0.340 | ✓ |
| Shoulder ⌀ | 12.42 | 0.489 | ✓ |
| Shoulder angle | 25° | — | ✓ |
| Base ⌀ | 13.03 | 0.513 | ✓ |
| Rim ⌀ | 13.51 | 0.532 | ✓ |
| Belt ⌀ | 13.51 | 0.532 | ✓ |
| Rim thickness | 1.27 | 0.050 | ✓ |
| Neck length | 6.70 | 0.264 | ≈ |
| Case length | 66.55 | 2.620 | ✓ |
| Overall length | 84.84 | 3.340 | ✓ |
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 Winchester Magnum is highlighted below.
Factory loads
In production — 806 active loads across 53 brands. Top 15 shown · see all 812 →.
| Brand | Load | Grain | Bullet | FPS | ft·lb | BC |
|---|---|---|---|---|---|---|
| Hornady | Superformance SST | 150 | SST | 3,400 | 3,850 | 0.257 G7 |
| Hornady | American Whitetail | 150 | InterLock BTSP | 3,290 | 3,605 | 0.338 G1 |
| Remington | Premier AccuTip Boat Tail | 150 | AccuTip BT | 3,290 | 3,605 | 0.415 G1 |
| Hornady | American Whitetail Interlock SP | 150 | Interlock SP | 3,290 | 3,605 | 0.338 G1 |
| Magtech | SP Hunting | 150 | SP | 3,290 | 3,605 | 0.338 G1 |
| CBC | FMJ 150gr | 150 | FMJ | 3,290 | 3,605 | 0.338 G1 |
| Remington | Express | 150 | PSP | 3,290 | 3,605 | 0.338 G1 |
| Federal | Fusion SP | 150 | Fusion SP | 3,290 | 3,605 | 0.338 G1 |
| Fiocchi | Extrema SST | 150 | SST Polymer Tip | 3,290 | 3,605 | 0.257 G7 |
| PPU | SP Hunting | 150 | SP | 3,290 | 3,605 | 0.338 G1 |
| Remington | Premier AccuTip | 150 | AccuTip-V Polymer Tip | 3,290 | 3,605 | 0.415 G1 |
| Fiocchi | SP Hunting | 150 | SP | 3,290 | 3,605 | 0.338 G1 |
| Remington | Core-Lokt Ultra Bonded | 150 | Core-Lokt Ultra Bonded HP | 3,290 | 3,605 | 0.338 G1 |
| Remington | Core-Lokt Tipped | 150 | Core-Lokt Tipped | 3,290 | 3,605 | 0.338 G1 |
| IMI | FMJ Ball | 150 | FMJ | 3,290 | 3,605 | 0.338 G1 |
Velocities are manufacturer-stated (test-barrel). Discontinued loads dimmed.
Suitable powders
32 reloading powders listed for .300 Winchester 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 Winchester Magnum
12 models in the database chamber .300 Winchester Magnum. Browse all →
Lineage
Connected reference
History
Introduced by Winchester in 1963 as part of their magnum lineup. Quickly became most popular .30 magnum. Adopted by military snipers in 1990s as improvement over .308.
FAQs
- What twist rate does .300 Winchester Magnum use?
- .300 Winchester Magnum typically uses a 1:10 twist rate.
- What bullet diameter is .300 Winchester Magnum?
- .300 Winchester Magnum uses a 0.308″ (7.823 mm) diameter bullet.
- Is .300 Winchester Magnum still in production?
- .300 Winchester Magnum is active; typical availability is abundant.
- What is .300 Winchester Magnum used for?
- .300 Winchester Magnum is primarily used for hunting, military, target.
- What is .300 Winchester Magnum based on?
- .300 Winchester Magnum is derived from the .375 H&H Magnum case.
- What are the best powders for .300 Winchester Magnum?
- Reloading powders commonly listed for .300 Winchester Magnum include Superperformance, N560, Norma 204, Norma MRP, among 32 suitable options.
Sources & provenance
- StandardSAAMI — SAAMI cartridge & chamber drawing — .300 Winchester 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 806 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →