Garand Thumb · Video summary
How Deadly Is 5.56 At Close Range?
Testing reveals 5.56mm is highly lethal at close range, with barrel length having less impact than projectile type on terminal ballistics.
Watch on YouTube ↗Key takeaways
- 🔍Ballistic gelatin provides a repeatable test medium for comparing projectile performance, offering relative insights into how rounds destabilize and fragment, even if not a perfect analog for human tissue.03:18
- 📈Increased muzzle velocity from longer barrels (11.5" and 16") generally leads to more projectile fragmentation and faster energy transfer, though the difference diminishes at very close range.09:51
- 💪Short-barreled rifles (like the 10.3" Mark 18) firing effective 5.56mm ammunition are still highly lethal at typical close-quarters engagement distances.14:04
- 🚀At distances beyond 100 yards, barrel length and velocity become more critical for maintaining projectile effectiveness and fragmentation, whereas at very close range, projectile design is the primary driver.17:52
- 💡Even the historically criticized M855 green tip round performed well at close range, demonstrating good yawing and fragmentation, contrary to some common perceptions.19:36
- 🔧Prioritize ammunition selection for short-barreled 5.56mm firearms, focusing on projectile design for optimal close-range terminal ballistics.25:01
Chapters
- 0:04🎯 Introduction and Video Scope
- 2:47🔬 Experimental Setup
- 3:43📭 Ammunition Selection
- 5:22🔫 Rifle Selection and Setup
- 6:07💥 M855 (Green Tip) from 10.3" Barrel at Close Range
- 8:45🚀 M855 (Green Tip) from 11.5" Barrel at Close Range
- 10:23💨 M855 (Green Tip) from 16" Barrel at Close Range
- 12:00💧 68gr Hollow Point from 10.3" Barrel at Close Range
- 14:12🌟 68gr Hollow Point from 11.5" Barrel at Close Range
- 16:00✨ 68gr Hollow Point from 16" Barrel at Close Range
- 18:14⬆️ Transition to 125 Yards Testing
- 18:31🎯 M855 (Green Tip) from 10.3" Barrel at 125 Yards
- 20:18🚀 M855 (Green Tip) from 11.5" Barrel at 125 Yards
- 21:53💨 M855 (Green Tip) from 16" Barrel at 125 Yards
- 23:10💧 68gr Hollow Point from 10.3" Barrel at 125 Yards
- 25:14🌟 68gr Hollow Point from 11.5" Barrel at 125 Yards
- 27:18✨ 68gr Hollow Point from 16" Barrel at 125 Yards
- 27:35✅ Conclusion on Close-Range Lethality
- 28:40🔮 Future Testing and Dad Advice
The digest
This thorough examination focuses on how effective 5.56mm rounds are at close distances, testing different barrel lengths and ammunition types to address common misconceptions about their stopping power. The analysis is valuable for military personnel, law enforcement, firearms enthusiasts, and defensive shooters seeking clear, science-based insights into 5.56 performance, especially with shorter barrels that are often questioned for lethality beyond 100 yards.
High-Level Overview
The core investigation explores the terminal ballistics of 5.56 caliber ammunition fired from barrels of varying lengths—specifically 10.3 inches (Mark 18), 11.5 inches (URGI), and 16 inches (AeroPrecision)—at close range. The study uses high-speed video and gel block testing to determine how barrel length and ammunition type impact lethality and fragmentation. This matters because shorter-barrel AR-style rifles are popular in tactical and self-defense contexts, yet many believe their effectiveness drops off sharply beyond very short distances. The findings challenge these assumptions and provide empirical data on how well 5.56mm performs in realistic scenarios.
Keep reading in The Digest
The full 5-minute article, 10 more sections, and every new episode from Garand Thumb and the creators you follow.
- In-Depth Analysis
- Setup and Test Methodology
- Barrel Length and Velocity
- M855 “Green Tip” Performance
- Hornady 68-Grain Boat-Tailed Hollow Point (BTHP)
- Close-Range Terminal Effects
- Longer Range Testing (125 Yards)
- Key Framework: Ballistic Performance Factors at Close Range
- Practical Implications & Takeaways
- Action-Oriented Summary
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