The .338 WBY RPM is derived from the Weatherby 6.5 RPM, necked up to accommodate a .338 caliber bullet. Designed to optimize Weatherby's 6-lug action, it delivers magnum level performance in an ultralight 5 lb rifle. Its large body diameter, minimal taper and 35 deg shoulder maximize case capacity, resulting in higher velocities and superior ballistic performance.

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