Description

Fort Scott Munitions 300 AAC Blackout 190gr TUI — 320 Rounds

The Fort Scott Munitions 300 Blackout TUI is the subsonic suppressor load in the .300 AAC Blackout category.

A 190-grain solid copper Tumble Upon Impact bullet at 960 fps, engineered for suppressed ARs and home defense use at subsonic velocities.

At $1.56 per round for 320 rounds, this is the specialized solution standard .300 BLK loads don’t address.

What Is TUI — Tumble Upon Impact

Conventional hollow point bullets expand on impact through hydraulic pressure. Expansion requires sufficient impact velocity — typically above 1,200 fps. Below that threshold, hollow points may pass through tissue without opening.

The Fort Scott Munitions 300 Blackout TUI solves this with a solid copper bullet machined to initiate tumbling on soft-tissue contact.

As the bullet tumbles, it transfers energy through hydrostatic shock — creating a wound cavity impossible from a non-tumbling projectile at subsonic velocity.

The result: effective terminal performance from the Fort Scott Munitions 300 Blackout TUI at 960 fps — well below where conventional hollow points work reliably.

The Subsonic .300 BLK Use Case

The .300 AAC Blackout was specifically designed to function from a suppressed AR-15 platform with both supersonic and subsonic loads. 190 grains at 960 fps is the subsonic tier.

Suppressed subsonic .300 BLK is among the quietest centerfire rifle configurations available — comparable to hearing safe from a properly suppressed host, without the recoil of a larger suppressor-compatible caliber.

The Fort Scott Munitions 300 Blackout TUI cycles reliably with or without a suppressor.

For home defense in an AR-format rifle, suppressed subsonic eliminates both the hearing damage risk and the blast noise inside an enclosed space.

Solid Copper — Lead-Free

The 190-grain bullet is precision-machined solid copper — no lead, no jacket. Lead-free for indoor ranges and California condor zone compliance. Solid copper retains near-100% weight through penetration.

Specifications

• Caliber: .300 AAC Blackout (7.62×35mm)
• Bullet: 190 grain, TUI Solid Copper (Tumble Upon Impact)
• Muzzle velocity: 960 fps (subsonic)
• Application: Suppressed home defense, suppressed hunting, indoor range
• Lead free: Yes — solid copper
• Cartridge case: Brass, reloadable
• Primer: Centerfire
• Quantity: 320 rounds (16 × 20-round boxes)
• Fort Scott Munitions designation: Sub-Munitions TUI

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

---

SHORT DESCRIPTION (above Add to Cart)

Fort Scott Munitions .300 AAC Blackout. 190-grain solid copper TUI (Tumble Upon Impact) — subsonic at 960 fps. Designed for suppressed home defense use: tumbling mechanism delivers effective terminal performance below the expansion threshold of conventional hollow points. Lead-free, California compliant. Brass, reloadable. 320 rounds (16 × 20-round boxes). Subsonic suppressor load — not a standard range or hunting round.

---

💬 Before You Go — Running Suppressed 300 BLK?

Using this in a suppressed build? Leave a review with the suppressor and host barrel length, and how the TUI performed on paper or game. Suppressed subsonic .300 BLK is a niche with genuinely sparse real-world performance data — your field experience is the most useful content on this page. And if you came looking for a .300 BLK load we don’t carry, tell us. 🎯

---

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. Suppressors are regulated under the National Firearms Act — verify local laws before purchasing. Not for sale to prohibited persons.

Frequently Asked Questions

What is TUI — Tumble Upon Impact? Fort Scott Munitions’ patented terminal ballistics mechanism for solid copper bullets. The nose geometry initiates tumbling on contact with soft tissue, transferring energy through hydrostatic shock. Designed specifically for subsonic velocities where conventional hollow points don’t reliably expand — below approximately 1,200 fps.

Will this cycle an unsuppressed AR? Fort Scott Munitions confirms the TUI Sub-Munitions cycle with or without a suppressor. Subsonic .300 BLK can be finicky in gas-impingement ARs without a suppressor — verify your specific rifle’s cycling reliability with a few rounds before relying on it.

Why 190 grains for subsonic .300 BLK? Heavier bullets stay subsonic at the necessary velocity. .300 BLK subsonic loads typically run 190–220 grains at 960–1,050 fps. The 190-grain bullet is in the standard subsonic range for the cartridge.

Is this lead-free? Yes — precision-machined solid copper, no lead.

How quiet is suppressed subsonic .300 BLK? Suppressed subsonic .300 BLK from a quality suppressor can approach hearing-safe levels (under 140 dB) at the shooter’s ear. Actual sound levels depend on suppressor, barrel length, ammunition lot, and ambient conditions. This is among the quietest centerfire rifle configurations commercially available.

Can I reload the brass? Yes — standard brass, Boxer-primed.

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

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