Sierra 8mm 220gr SBT

Sierra 8mm 220gr SBT GameKing

The Sierra 8mm 220gr SBT GameKing is a match-grade component bullet crafted for handloaders and hunters pursuing long-range magnum performance, aerodynamic stability, and consistent terminal accuracy in 8mm platforms. Featuring a sleek Spitzer boat-tail profile with a robust 220-grain weight and .323‑inch diameter, this bullet blends exceptional external ballistics with deep energy transfer—ideal for cartridges such as 8×57 Mauser, 8mm Remington Magnum, and various wildcat calibers.

Engineered with a refined Spitzer ogive and precision-formed boat-tail base, the 220gr SBT GameKing achieves a G1 ballistic coefficient approaching 0.600. This high BC minimizes drag, enhances wind-resistance, and sustains supersonic flight well beyond 1,000 yards. Its streamlined design reduces turbulence, improves stability, and supports flat trajectory performance—making it suitable for competitive shooting, precision hunting, and extended-range engagements.

Manufactured to Sierra’s stringent component tolerances—220.0 grains weight, 0.323″ diameter, approximately 1.250″ overall length, and a sectional density near 0.325—the bullet delivers uniform jacket thickness, crisp meplat alignment, and tight concentricity. This precision enhances seating consistency, maintains stable chamber pressures, and delivers consistent muzzle velocities, enabling tight group performance even under magnum recoil.

Optimized for barrels with high twist rates between 1:9 and 1:11, the Sierra 8mm 220gr SBT GameKing excels at velocities ranging from 2,600 to 2,800 fps. Reloaders frequently achieve sub‑MOA accuracy and reliable wind drift control at long distances. The Spitzer boat-tail geometry delivers improved BC, while the 220gr weight offers enough mass for deep penetration—making this bullet especially effective on large and dangerous game in varied terrain.

As a component bullet, the Sierra 8mm 220gr SBT GameKing gives handloaders full control over powder selection, primer type, and seating depth—enabling tailored load development for specific recoil comfort, trajectory optimization, and terminal objectives. It is not factory-loaded ammunition but a premium Spitzer MatchKing-quality component designed for serious magnum shooters seeking precision, power, and versatility in 8mm cartridge use.