Description

Sierra GameChanger 300 AAC Blackout 125gr TGK — 320 Rounds

The Sierra GameChanger 300 Blackout is the supersonic hunting load in the .300 AAC Blackout category.

A 125-grain Tipped GameKing boat-tail at 2,115 fps and G1 BC 0.298, designed for deer and hog hunting from MSRs and bolt-action rifles.

At $1.56 per round for 320 rounds, the Sierra GameChanger 300 Blackout is the supersonic option — contrasting with the Fort Scott Munitions 190gr TUI at 960 fps for suppressed subsonic use.

The Tipped GameKing — Sierra’s Hunting Bullet

The Tipped GameKing (TGK) is Sierra’s polymer-tipped boat-tail hunting bullet — a lead-core, thick copper-jacketed projectile with a polymer tip inserted into the hollow point cavity to initiate rapid expansion on impact.

Three features define the TGK for hunting applications:

Polymer tip. The tip initiates expansion mechanically rather than relying solely on hydraulic pressure. Consistent expansion initiation across a range of impact velocities and target angles — important for hunting where shot presentations are unpredictable.

Boat-tail base. The tapered base reduces base drag and improves the G1 BC, maintaining velocity downrange. At G1 BC 0.298, the Sierra GameChanger 300 Blackout retains useful velocity to the moderate ranges where .300 BLK hunting is typically conducted.

Thick copper jacket. The jacket controls expansion rate, preventing the bullet from breaking apart on impact while still allowing the front half to mushroom fully. Sierra specifies controlled expansion and weight retention.

Supersonic .300 BLK — What It Means Practically

At 125 grains and 2,115 fps, the Sierra GameChanger 300 Blackout is supersonic — above the speed of sound (~1,125 fps) — and produces a standard supersonic crack in addition to the host firearm’s report.

For hunting — where terminal performance matters more than sound signature — the supersonic TGK delivers meaningful energy and expansion at the distances .300 BLK is typically used.

Typical .300 BLK hunting engagements run inside 200 yards from an MSR platform.

Specifications

• Caliber: .300 AAC Blackout (7.62×35mm)
• Bullet: 125 grain, Sierra Tipped GameKing (TGK), boat-tail
• Muzzle velocity: 2,115 fps (supersonic)
• G1 BC: 0.298
• Application: Deer, hog, medium game hunting; MSR and bolt-action
• Lead free: No
• Cartridge case: Brass, reloadable
• Primer: Centerfire
• Quantity: 320 rounds (16 × 20-round boxes)

Browse the .300 AAC Blackout ammunition category. Specifications are published by SAAMI and by Sierra Bullets directly. Safe storage guidance is available from the NSSF.

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SHORT DESCRIPTION (above Add to Cart)

Sierra GameChanger .300 AAC Blackout. 125-grain Tipped GameKing boat-tail — polymer tip for consistent expansion, thick copper jacket for weight retention. 2,115 fps, G1 BC 0.298. Supersonic hunting load for MSR and bolt-action. Deer, hog, medium game. Brass, reloadable. 320 rounds (16 × 20-round boxes). Supersonic hunting load — not a subsonic or suppressor round.

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💬 Before You Go — Hunting with .300 BLK?

Taken deer or hog with the Sierra GameChanger in a 300 Blackout build? Leave a review with barrel length and shot distance. Suppressed MSR hunting with .300 BLK is a growing use case and Sierra TGK field reports at hunting distances are a real resource gap. And if you came looking for a .300 BLK load we don’t carry, tell us. 🎯

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Please purchase and use ammunition responsibly and in accordance with all federal, state and local laws. Ammunition cannot be shipped to all jurisdictions — verify legal shipment to your address before ordering. Buyers must be of legal age in their jurisdiction. Not for sale to prohibited persons. Verify state and local hunting regulations before field use.

Frequently Asked Questions

What is the Tipped GameKing (TGK) and how does it differ from a standard soft point? The TGK is Sierra’s polymer-tipped boat-tail hunting bullet. A standard soft point uses exposed lead at the tip to initiate expansion. The TGK uses a polymer tip, which initiates expansion more consistently and predictably across different impact velocities and angles — important for hunting where shot presentation varies.

Is 2,115 fps supersonic for .300 BLK? Yes — the speed of sound is approximately 1,125 fps at sea level. 2,115 fps is well above that, producing a supersonic crack in addition to the host rifle’s report. The Fort Scott Munitions 190gr TUI at 960 fps in this category is the subsonic option.

What’s the effective range for deer hunting with this load? .300 BLK is generally considered effective to 150–200 yards for deer from a 16″ barrel. The G1 BC of 0.298 means the bullet drops velocity more quickly than higher-BC cartridges; terminal performance at extended range should be confirmed with ballistic data before hunting at distances beyond 200 yards.

Can I shoot this suppressed? Yes — supersonic ammunition can be shot through a suppressor. It will not be as quiet as subsonic; the supersonic crack remains. For suppressed use where hearing-safe levels are the goal, the Fort Scott Munitions 190gr TUI (subsonic, 960 fps) is the alternative in this category.

Is the brass reloadable? Yes — standard brass, Boxer-primed.

What is G1 BC 0.298? G1 Ballistic Coefficient measures how efficiently the bullet retains velocity. Higher BC = less drag = less velocity loss downrange. 0.298 is moderate — appropriate for the engagement distances .300 BLK is typically used indoors.

How many rounds is 320? 16 × 20-round boxes.

What’s the per-round cost? $500 / 320 = $1.5625 per round.