Lindcott Armory Rifle · SAAMI
.338 Remington Ultra Magnum
The .338 caliber member of Remington's Ultra Mag family.
- Caliber
- 0.338″ · 8.585 mm
- Introduced
- 2002
- Case
- Rebated
- Parent
- .300 Remington Ultra Magnum
- Primary use
- Hunting
- Status
- Active
- Introduced
- 2002
- Type
- Rifle
- Origin
- United States
- Inventor
- Remington Arms
- Manufacturer
- Remington / Federal
- Standard
- SAAMI
- Status
- Active
- Availability
- Specialty
- Case capacity
- 115 gr H₂O
- Twist (typical)
- 1:10
- Primer
- Large Rifle Magnum
- Case type
- Rebated
- Max pressure
- 65,000 psi
- Eff. range
- 600 yd
- Max range
- 1500 yd
- Recoil
- 15–22 ft·lb
Ballistics
Real trajectory computed from a representative load — Hornady Precision Hunter ELD-X 270 gr, 2,950 fps, BC 0.320 G7 · 100 yd zero.
| Range | Velocity | Energy | Drop (in) | Drop (MOA) |
|---|---|---|---|---|
| 0 yd | 2949 | 5214 | -1.5″ | — |
| 100 yd | 2804 | 4713 | 0.0″ | 0.0 |
| 200 yd | 2662 | 4247 | -2.9″ | -1.4 |
| 300 yd | 2524 | 3818 | -10.8″ | -3.4 |
| 400 yd | 2389 | 3420 | -24.1″ | -5.8 |
| 500 yd | 2258 | 3057 | -43.5″ | -8.3 |
| 600 yd | 2132 | 2724 | -69.7″ | -11.1 |
| 700 yd | 2009 | 2419 | -103.6″ | -14.1 |
| 800 yd | 1889 | 2139 | -146.1″ | -17.4 |
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 .338 Remington Ultra 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 · verified| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 8.59 | 0.338 | ✓ |
| Neck ⌀ | 9.42 | 0.371 | ✓ |
| Shoulder ⌀ | 13.36 | 0.526 | ✓ |
| Shoulder angle | 30° | — | ✓ |
| Base ⌀ | 13.97 | 0.550 | ✓ |
| Rim ⌀ | 13.56 | 0.534 | ✓ |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.27 | 0.050 | ✓ |
| Neck length | 8.38 | 0.330 | ≈ |
| Case length | 70.10 | 2.760 | ✓ |
| 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. .338 Remington Ultra Magnum is highlighted below.
Factory loads
In production — 15 active loads across 7 brands. Top 15 shown.
| Brand | Load | Grain | Bullet | FPS | ft·lb | BC |
|---|---|---|---|---|---|---|
| Nosler | Trophy Grade AccuBond | 225 | AccuBond | 3,000 | 4,496 | 0.278 G7 |
| Barnes | VOR-TX TTSX BT | 225 | TTSX BT | 2,980 | 4,436 | 0.215 G7 |
| Hornady | Precision Hunter ELD-X | 270 | ELD-X | 2,950 | 5,216 | 0.320 G7 |
| Federal | Trophy Bonded Bear Claw | 225 | Trophy Bonded Bear Claw | 2,980 | 4,436 | — |
| Barnes | TTSX | 225 | TSX-BT | 2,950 | 4,347 | — |
| Barnes | LRX BT | 225 | LRX BT | 2,920 | 4,259 | — |
| Hornady | Precision Hunter | 230 | ELD-X | 2,900 | 4,294 | — |
| Remington | Core-Lokt PSP | 250 | Core-Lokt PSP | 2,860 | 4,540 | — |
| Remington | Premier Core-Lokt Ultra Bonded | 250 | Core-Lokt Ultra Bonded | 2,860 | 4,540 | — |
| Remington | Premier | 250 | Core-Lokt Ultra | 2,860 | 4,540 | — |
| Remington | Core-Lokt | 250 | SP | 2,860 | 4,540 | — |
| Norma | Oryx | 250 | Oryx | 2,860 | 4,540 | — |
| Black Hills | Gold | 250 | AccuBond | 2,860 | 4,540 | — |
| Nosler | Trophy Grade | 250 | AccuBond | 2,860 | 4,540 | — |
| Federal | Premium | 250 | Trophy Bonded | 2,860 | 4,540 | — |
Velocities are manufacturer-stated (test-barrel). Discontinued loads dimmed.
Suitable powders
9 reloading powders listed for .338 Remington Ultra 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.
Lineage
Connected reference
History
Introduced in 2002 on the same rebated-rim Ultra Mag case as the .300 RUM. The .338 RUM filled the gap between .338 Winchester Magnum and the more exotic .338 Lapua Magnum — offering near-Lapua performance in a platform more accessible to hunters than the Lapua's military-derived bolt actions. Remington chambered the Model 700 in .338 RUM; Federal produced Vital-Shok ammunition. The .338 Lapua's growing commercial presence and the .338 Norma Magnum's introduction have squeezed the .338 RUM's market position, but Remington and Federal continue production.
FAQs
- What twist rate does .338 Remington Ultra Magnum use?
- .338 Remington Ultra Magnum typically uses a 1:10 twist rate.
- What bullet diameter is .338 Remington Ultra Magnum?
- .338 Remington Ultra Magnum uses a 0.338″ (8.585 mm) diameter bullet.
- Is .338 Remington Ultra Magnum still in production?
- .338 Remington Ultra Magnum is active; typical availability is specialty.
- What is .338 Remington Ultra Magnum used for?
- .338 Remington Ultra Magnum is primarily used for hunting.
- What is .338 Remington Ultra Magnum based on?
- .338 Remington Ultra Magnum is derived from the .300 Remington Ultra Magnum case.
- What are the best powders for .338 Remington Ultra Magnum?
- Reloading powders commonly listed for .338 Remington Ultra Magnum include N170, Reloader 25, Reloader 26, IMR 7977, among 9 suitable options.
Sources & provenance
- StandardSAAMI — SAAMI cartridge & chamber drawing — .338 Remington Ultra Magnumarchived
- StandardSAAMI — ANSI/SAAMI Z299 — Cartridge & Chamber Drawingsarchived
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 →