Weatherby Select 338 RPM ammunition delivers the power needed for serious backcountry hunters who refuse to compromise. Introduced in 2022, the 338 RPM (rebated precision magnum) was engineered to push the limits of lightweight, packable rifle platforms—particularly the Mark V 6 Lug action—without sacrificing the downrange performance required for North America's largest game. These 228-grain Hornady InterLock Spire Point loads represent premium factory ammunition built to exacting standards for the shooter who demands consistency in the field.

The 338 RPM cartridge itself is a sophisticated design, developed by necking up the 6.5 RPM case to accept a .338 caliber bullet. The case geometry features a large body diameter, minimal body taper, and a 35-degree shoulder that work together to maximize powder capacity and generate velocities that rival conventional magnum cartridges in shorter, easier-to-carry actions. This is ammunition designed for the hunter who needs authentic magnum performance from a rifle that won't punish them on a four-day mountain hunt.

Weatherby Select ammunition pairs this potent cartridge with Hornady's InterLock bullet technology—a proven, all-purpose big-game bullet with a bonded core and cannelured jacket. This round-nose projectile is built to penetrate deeply and deliver reliable expansion on elk, moose, and other heavy-bodied game. Each box contains 20 rounds, and every component is QC-tested to ensure the consistency that backcountry hunting demands. If you're building or already running a 338 RPM rifle, this is ammunition you can trust.

Weatherby Select 338 RPM ammunition delivers the power needed for serious backcountry hunters who refuse to compromise. Introduced in 2022, the 338 RPM (rebated precision magnum) was engineered to push the limits of lightweight, packable rifle platforms—particularly the Mark V 6 Lug action—without sacrificing the downrange performance required for North America's largest game. These 228-grain Hornady InterLock Spire Point loads represent premium factory ammunition built to exacting standards for the shooter who demands consistency in the field.

The 338 RPM cartridge itself is a sophisticated design, developed by necking up the 6.5 RPM case to accept a .338 caliber bullet. The case geometry features a large body diameter, minimal body taper, and a 35-degree shoulder that work together to maximize powder capacity and generate velocities that rival conventional magnum cartridges in shorter, easier-to-carry actions. This is ammunition designed for the hunter who needs authentic magnum performance from a rifle that won't punish them on a four-day mountain hunt.

Weatherby Select ammunition pairs this potent cartridge with Hornady's InterLock bullet technology—a proven, all-purpose big-game bullet with a bonded core and cannelured jacket. This round-nose projectile is built to penetrate deeply and deliver reliable expansion on elk, moose, and other heavy-bodied game. Each box contains 20 rounds, and every component is QC-tested to ensure the consistency that backcountry hunting demands. If you're building or already running a 338 RPM rifle, this is ammunition you can trust.