Sierra 284 Cal 7mm 140gr SBT

Sierra 284 Cal 7mm 140gr SBT

The Sierra 284 Cal 7mm 140gr SBT is a precision-hunted component bullet featuring a traditional Spitzer boat-tail profile designed for performance-driven handloaders and hunters using .284‑inch 7mm rifles. Its double-tapered Sierra jacket adds durability and long-range effectiveness, making it an ideal lighter option for all 7mm magnum cartridges. This 140‑grain #1905 bullet delivers a flat trajectory, reliable terminal performance, and deep penetration in 7mm‑08 Remington, 7mm Remington Magnum, 7mm PRC, and other popular 7mm platforms.

Equipped with a sleek Spitzer ogive and tapered boat-tail base, the bullet achieves strong external ballistics and wind resistance, excelling at ranges from medium to long distances. Its lightweight design and aerodynamic profile support sustained supersonic flight, while the heavy-duty jacket ensures structural integrity and consistent performance under high-velocity hunting conditions.

Manufactured to Sierra’s stringent component specifications—140.0 grains weight, 0.284″ diameter, approximately 1.075″ overall length, and a sectional density near 0.277—the bullet features uniform jacket thickness, precise meplat alignment, and tight concentricity. These qualities support accurate seating, stable chamber pressures, and sub‑MOA accuracy in tuned handloads.

In rifles chambered for 7mm magnum cartridges, the 140gr SBT is praised as an excellent all-purpose bullet that balances long-range trajectory with decisive terminal performance. It serves equally well in 7mm‑08 Remington when driven to approximately 2,500 fps or higher, making it a versatile option for both hunting and precision target shooting.

Although the 140gr #1905 SBT is too structurally robust for use in smaller 7mm handgun cartridges like 7mm TCU or 7mm BR, it is frequently loaded into platforms such as the Remington XP‑100 chambered in 7mm‑08 Remington. In these high-pressure, high-velocity setups exceeding 2,500 fps, it performs exceptionally for hunting medium and large game at typical handgun ranges while remaining a solid choice for extended-range target work.

As a component bullet, the Sierra 284 Cal 7mm 140gr SBT provides handloaders full control over powder choice, primer selection, and seating depth—facilitating customized load development focused on trajectory, recoil, and terminal effect. It is not factory-loaded ammunition but a premium Spitzer boat-tail component engineered for elite performance in both rifle and select high-velocity handgun applications.