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If you run a short-barreled rifle, you've probably noticed that standard 5.56 NATO ammo can leave you with a fireworks show downrange and performance that doesn't quite measure up at reduced velocities. Hornady Black solved this by engineering the InterLock HD SBR specifically for 10.5 to 11.5 inch barrels, where the velocity loss would typically be a real problem.
This round uses proprietary propellant technology tuned to burn cleaner and more completely in short barrels. The result is about 15 to 20 percent less heat generation, which means minimal flash, virtually no residue, and a dramatically reduced sound signature compared to typical 5.56 loads. When you're running suppressed, that clean-burning powder means less carbon fouling in your can and bolt, keeping everything cycling reliably through long training sessions or extended courses of fire.
The 75-grain InterLock HD bullet is derived from Hornady's Critical Duty FlexLock design, built with an exposed soft point tip and a heavy-duty jacket-to-core band that locks the bullet together. This design expands reliably even at the lower velocities your SBR produces, and it meets FBI protocol requirements for consistent penetration and barrier performance. The bullet feeds smoothly in all AR platforms, direct impingement or piston systems, suppressed or unsuppressed.
Chronograph data shows 2321 fps at the muzzle from a test barrel with 897 foot-pounds of energy. From a 10.5 inch barrel, you'll see some velocity loss compared to those numbers, but the ammunition was engineered to maintain terminal effectiveness despite that velocity reduction. The uniform ballistics and consistent internal pressures mean your rifle will cycle without hiccups and your shots will print consistently at defensive distances.
Yes, it'll feed and function fine in standard AR-15s. However, it's specifically engineered for 10.5 to 11.5 inch SBRs where the clean powder and bullet design really shine. In longer barrels you might not see the same benefit from the clean-burning propellant, and standard 5.56 loads may serve you just as well.
This is where the InterLock HD SBR really stands out. The clean-burning propellant produces virtually no residue, which means your suppressor stays cleaner and your rifle cycles reliably through extended shooting sessions. You'll get a dramatic reduction in sound signature compared to standard 5.56 loads, and the ammunition won't overheat or foul your can.
Hornady lists velocities from a 20-inch test barrel. From a 10.5-inch SBR, expect roughly 150 to 200 fps less than that spec. The ammunition was engineered knowing this and the bullet design maintains expansion capability at these reduced velocities, making it a better choice for short barrels than lighter or heavier general-purpose 5.56 loads.
Yes, it's designed to meet FBI protocol requirements, which means it's been tested for consistent penetration and expansion through barriers like heavy clothing, drywall, and auto glass. The InterLock bullet design ensures reliable expansion even at the reduced velocities you get from short barrels.
| Bullet Weight (Grains) | 75 |
|---|---|
| Caliber/Gauge | .223 REM/5.56 NATO |
| Case Material | Brass |
| Cost per Round | 1.35 |
| Grains | 75Gr |
| Length | 4.5000 |
| Manufacturer | |
| Manufacturer Part Number | 81296 |
| Model | |
| Product Type | InterLock |
| Safety | Centerfire |
| Shipping Weight | 0.605 |
| Sights | Centerfire |
| Units per Box | 20 |
| UPC | 090255812961 |
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