Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, competitive shooter.
Underwood 338 Lapua Magnum ammunition pairs the 300-grain Nosler Custom Competition jacketed hollow point with flash-suppressed powder charges hand-thrown for consistency across every round. This match-grade load exits the muzzle at 2700 feet per second with 4856 foot-pounds of energy — velocity and terminal performance engineered for precision rifles chambered in one of the most capable long-range cartridges available. The 338 Lapua Magnum is a bottlenecked, centerfire rifle cartridge designed in the 1980s for military sniper applications, delivering flat trajectories and retained energy beyond 1500 yards. Underwood sources Nosler Custom Competition bullets — a hollow point design with pronounced boat-tail geometry for reduced drag and a small meplat that improves aerodynamic efficiency across supersonic and transonic flight regimes. Each cartridge is loaded in nickel-plated brass cases that resist tarnish, feed reliably in bolt-action and semi-automatic platforms, and maintain dimensional stability through multiple reload cycles. This 338 Lapua ammo is boxer-primed, non-corrosive, and reloadable — attributes that matter when training volume drives cost and shooters demand factory-level quality in every hand-cycled round.
Performance at a Glance
| Spec | Value |
|---|---|
| Caliber | 338 Lapua Magnum |
| Bullet weight | 300 Grains |
| Bullet type | Jacketed Hollow Point |
| Bullet brand | Nosler Custom Competition |
| Muzzle velocity | 2700 Feet Per Second |
| Muzzle energy | 4856 Foot Pounds |
| G1 Ballistic Coefficient | 0.768 |
| Sectional Density | 0.375 |
| Rounds/box | 10 Round |
| Case | Nickel Plated Brass |
| Primer | Boxer |
| Corrosive | No |
| Reloadable | Yes |
| Velocity rating | Supersonic |
| Intended use | Range & Target, Long Range Hunting |
| Manufacturer | Underwood Ammo |
The Nosler Custom Competition bullet delivers a boat-tail hollow point profile engineered for accuracy at distance — the 0.768 G1 ballistic coefficient indicates superior retention of velocity through air, translating to flatter trajectories and reduced wind drift compared to bullets with lower BC values. Sectional density of 0.375 supports penetration on large game when this load is applied to hunting contexts, though its primary design intent centers on match and target shooting. Underwood hand-throws powder charges in small batches, a process that minimizes charge weight variation and improves shot-to-shot consistency — critical when competing at ranges where a tenth of a grain can shift point of impact. Flash-suppressed powder protects low-light vision, and nickel-plated cases resist corrosion during storage or field carry. Each case accepts standard large rifle primers during the reloading process, and the nickel surface eases debris removal during tumbling.
Safe Handling & Compliance
Federal law requires purchasers to be at least 18 years old for rifle and shotgun ammunition, and at least 21 for handgun ammunition. Ammunition cannot be shipped to certain states, counties, and cities — review our ammunition shipping restrictions before ordering. Store ammunition in a cool, dry location away from heat sources and out of reach of unauthorized users.
- Always follow the four rules of firearm safety — treat every firearm as if it is loaded, never point the muzzle at anything you are not willing to destroy, keep your finger off the trigger until ready to fire, and be certain of your target and what lies beyond it.
- Verify current federal, state, and local laws governing ammunition purchase, possession, and transport in your jurisdiction before ordering. Some states impose magazine capacity limits, ammunition registration requirements, or background checks at point of transfer.
- This ammunition contains lead. Wash hands thoroughly after handling, and follow California Proposition 65 warnings regarding lead exposure during use and storage.
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