Black Hills 5.56x45mm NATO Ammo 77 Grain Open Tip Match

Black Hills 5.56 77 grain OTM ammo pairs a Sierra MatchKing open-tip bullet with hand-inspected brass for serious long-range accuracy. This 77 grain Sierra MatchKing ammo suits precision shooters, not casual plinking. Therefore, Black Hills verifies velocity and pressure on every lot before it ships. As a result, this bulk 5.56 precision match ammo delivers match-grade consistency shot after shot. Specifically, it works well as AR-15 long range 5.56 ammo for shooters stretching distance. In addition, this load is the commercial version of MK 262 mod 1 ammo.

Black Hills 77gr OTM Rifle Ammo Specifications

• Caliber: 5.56x45mm NATO
• Bullet Weight: 77 Grain
• Bullet Type: Sierra MatchKing Open Tip Match (OTM)
• Case: Brass, boxer-primed, reloadable
• Rounds Per Box: 50
• Application: Precision, law enforcement, and long-range competition
• Equivalent Military Designation: MK 262 Mod 1 ammo

77 Grain Sierra MatchKing Ammo Built for Precision

The Sierra MatchKing bullet uses a tight boat-tail design for a high, consistent ballistic coefficient. Specifically, this shape resists wind drift better than lighter 55 or 62 grain loads. Also, Black Hills hand-inspects every load to standards above typical commercial production. Shooters who buy this bulk 5.56 precision match ammo often stock up for both training and competition. Furthermore, shooters comparing options can browse the full rifle ammo lineup for other match-grade choices.

AR-15 Long Range 5.56 Ammo for Serious Shooters

AR-15 long range 5.56 ammo like this load needs a 1:7 or 1:8 twist barrel to stabilize properly. In addition, this heavier 77 grain bullet outperforms lighter loads past 300 yards. Shooters running a slower twist rate should compare this load against lighter options in our 5.56x45mm NATO ammo selection. However, most modern AR-15 uppers ship with a compatible fast twist rate.

MK 262 Mod 1 Ammo, Trusted by Military Marksmen

MK 262 Mod 1 ammo became the standard designated marksman load for its extended-range performance. Because Black Hills builds the commercial equivalent, shooters get the same terminal and accuracy profile. Therefore, precision shooters trust this load for both training and match use. In short, it bridges the gap between duty ammo and dedicated match ammo.

Pairing Black Hills 77gr OTM Rifle Ammo with Your Setup

Shooters chambered in .223 Remington can also fire this 5.56x45mm NATO load safely in most cases. For comparison, browse our 223 Remington ammo selection for dedicated .223 loads. Additionally, hunters and trainers stocking up on lighter bulk ammo should see the Winchester 55 Grain M193 Value Pack for range days. For duty-style penetrator performance, the Winchester M855 SS109 62 Grain load is a strong complementary option.

Black Hills 77gr OTM Rifle Ammo FAQs

What twist rate does this Black Hills 77gr OTM rifle ammo need?

Black Hills 5.56 77 grain OTM ammo needs a 1:8 or faster twist barrel for proper stabilization. Specifically, a 1:7 twist is ideal, while 1:9 barrels may struggle at longer ranges. Slower twist rates like 1:12 will not stabilize this heavier bullet. Always check your barrel’s twist rate before shooting this load.

Is this ammo safe in any AR-15 chamber?

Yes, Black Hills 5.56 77 grain OTM ammo is safe in any rifle marked 5.56x45mm NATO. However, rifles marked .223 Remington only may see higher pressure with this load. Therefore, always confirm your chamber markings first. Most modern AR-15 platforms are dual-marked and handle this load safely.

Does this ammo use reloadable brass?

Black Hills 5.56 77 grain OTM ammo uses boxer-primed brass cases that are fully reloadable. As a result, handloaders can recover and reload spent cases after firing. Additionally, Black Hills brass is known for consistent wall thickness and long case life. This makes it a favorite among precision reloaders.

What velocity does this load produce?

Black Hills 5.56 77 grain OTM ammo produces approximately 2,750 feet per second from a 20-inch barrel. Specifically, velocity will run slightly lower from shorter 16-inch AR-15 barrels. Therefore, shooters should chronograph their own rifle for precise ballistic data. This velocity supports stable flight well past 500 yards. Always review safe handling guidance from the National Shooting Sports Foundation before heading to the range.

How should I store this Black Hills 77gr OTM rifle ammo?

Black Hills 5.56 77 grain OTM ammo should be stored in a cool, dry location away from direct sunlight. In addition, keeping ammo in its original sealed box prevents moisture exposure. Therefore, a sealed container or ammo can adds extra protection for long-term storage. Proper storage preserves accuracy and reliable ignition for years.