Sierra Tipped MatchKing (TMK) Bullets - 30 Caliber (.308 Diameter), 155 Grain, Polymer Tip Boat Tail

The Sierra Tipped MatchKing (TMK) 30 caliber 155 grain bullet is a flat-based round built for shooters who demand precision across AR and bolt-action platforms. Engineered with a polymer tip and boat-tail design, the TMK combines the accuracy heritage Sierra is known for with improved ballistic performance for mid-range velocity cartridges like the .300 AAC Blackout and standard .308 applications. The acetal resin tip boosts ballistic coefficient, helping maintain velocity and flatter trajectories downrange—a real advantage for distance shooting and training where consistent, predictable performance matters.

This is a precision-first bullet. Sierra MatchKing and Tipped MatchKing designs are built for accuracy, not expansion, which makes them ideal for target shooting, precision rifle competitions, and range work where you're chasing tight groups and repeatable shots. The jacket is engineered to withstand the velocity range of common .30 caliber mid-level loads, making the TMK a solid choice for reloaders working up consistent ammunition for AR-15 builds and bolt guns. If you're looking to reload ammo that shoots flat and true, this is a workable option—but know what you're buying: this is a match-grade bullet, not a hunting round.

Reloaders appreciate TMK bullets for their consistency and the ability to wring precision out of quality ammunition. Whether you're hand-loading for a precision rifle class, building subsonic .300 Blackout loads, or simply want repeatable accuracy at the range, the 155 grain TMK gives you the ballistic profile to dial in your rifle and trust your loads.

Key Features

• Polymer tip design improves ballistic coefficient for better downrange performance
• Boat-tail profile reduces drag and supports consistent velocity retention
• Flat-base construction—ideal for AR and bolt-action magazines
• Jacket designed to handle mid-level .30 caliber cartridge velocities
• Match-grade accuracy focus—built for precision, not hunting
• Versatile .308 diameter suits .300 AAC Blackout, .308 Winchester, and similar .30 caliber platforms

Specifications

Frequently Asked Questions

Are Sierra Tipped MatchKing bullets designed for hunting?

No. MatchKing and Tipped MatchKing bullets are match-grade designs built for accuracy and precision shooting. They are not recommended for most hunting applications. While they are sometimes used in varmint hunting, their design does not provide reliable explosive expansion compared to Sierra's Hornet Blitz or Varminter bullets at equivalent velocities. Use them for target shooting and range work.

What cartridges work with the 155 grain .308 TMK bullet?

The 155 grain .308 diameter Tipped MatchKing is designed for .30 caliber cartridges, including the .300 AAC Blackout, and will fit standard .308 Winchester and bolt-action .30 caliber magazine feeds. The jacket handles velocities from common mid-level .30 caliber loads. Always verify compatibility with your specific cartridge and rifle before loading.

Why does ballistic coefficient change at different velocities?

The ballistic coefficient (BC) of this bullet varies across velocity ranges: .519 BC above 1900 fps, .490 BC between 1900–1600 fps, and .420 BC below 1600 fps. This accounts for how the bullet behaves aerodynamically at different speeds. Higher velocity = higher BC and better downrange performance. Use the BC that matches your expected muzzle velocity for more accurate external ballistic calculations.

Will these work in AR-15 magazines?

Yes. The flat-base design of the 155 grain TMK is compatible with AR platform magazines and feeders. This makes them a practical choice for reloaders building .300 AAC Blackout and other .30 caliber AR ammunition.