81255
5.56 NATO
55 gr. GMX® TAP® BARRIER™

55 gr. GMX® TAP® BARRIER™ - Item No. 81255

cartridge
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TAP® Barrier™ turns cover into concealment. The “solid” choice for law enforcement and military professionals is the 5.56 NATO 55gr. GMX® TAP® Barrier™ from Hornady®. Constructed of a premium copper alloy, the 55 gr. GMX® has a B.C. of .245 and is a highly accurate solution for departments that are seeking a precise alternative to traditional bullets loaded in the 5.56 NATO. With its monolithic construction, the GMX® boasts dependable terminal performance and high weight retention when encountering barriers.

NOTE: NOT for use in 223 REM chambered guns.

BULLET

  • Ballistic Coefficient: .245
  • Sectional Density: .157
  • Bullet Length: .832"
  • Recommended Rifling Twist Rate: 1:7" to 1:12"
  • Characteristics: Hollow point, copper alloy with cannelure
  • GMX®

CASE

5.56 NATO
  • Manufacturer's Name (Hornady) and Caliber Designation (5.56 NATO) imprinted on case head
  • Match Grade Brass Composite

POWDER & PRIMER

  • Powder: Temperature stable with flash retardant, Increased powder charge to NATO specifications and pressure peak
  • Primer: Staked primer pocket, Sealed primer, Small rifle milspec primer

PACKAGING & LOT NUMBERS

  • 20 rounds per box
  • 10 boxes per case (200 rounds per case)
  • Lot numbers on each box and case
10.4" Heckler & Koch HK416 1:7" Muzzle 100 Yards 200 Yards 300 Yards 400 Yards 500 Yards
Velocity (fps) 2742 2383 2053 1751 1485 1264
Energy (ft lbs) 918 694 515 375 269 195
Trajectory (in) -2.5 1.8 0 -10.2 -31.8 -69.3
11.5" Bushmaster® XM15-E2S 1:9" Muzzle 100 Yards 200 Yards 300 Yards 400 Yards 500 Yards
Velocity (fps) 2985 2607 2259 1939 1649 1398
Energy (ft lbs) 1088 830 623 459 332 239
Trajectory (in) -2.5 1.3 0 -8.2 -25.8 -56.2
14.5" Colt® M4 Carbine 1:7" Muzzle 100 Yards 200 Yards 300 Yards 400 Yards 500 Yards
Velocity (fps) 3083 2697 2342 2015 1717 1456
Energy (ft lbs) 1161 888 670 496 360 259
Trajectory (in) -2.5 1.2 0 -7.5 -23.7 -51.8
16" DPMS AR-15 1:9" Muzzle 100 Yards 200 Yards 300 Yards 400 Yards 500 Yards
Velocity (fps) 3093 2706 2350 2023 1724 1462
Energy (ft lbs) 1168 894 675 500 363 261
Trajectory (in) 0 2.4 0 -8.7 -26.1 -55.2
16" Colt® Law Enforcement Carbine 1:7" Muzzle 100 Yards 200 Yards 300 Yards 400 Yards 500 Yards
Velocity (fps) 3131 2740 2382 2052 1751 1484
Energy (ft lbs) 1197 917 693 514 374 269
Trajectory (in) -2.5 1.1 0 -7.3 -22.9 -49.9
18.5" Ruger® Mini 14® 1:9" Muzzle 100 Yards 200 Yards 300 Yards 400 Yards 500 Yards
Velocity (fps) 3212 2814 2451 2115 1807 1534
Energy (ft lbs) 1260 967 733 546 399 287
Trajectory (in) -1 1.7 0 -7.5 -22.9 -49.1
20" 5.56x45mm NATO Test Barrel 1:7" Muzzle 100 Yards 200 Yards 300 Yards 400 Yards 500 Yards
Velocity (fps) 3267 2864 2497 2157 1846 1567
Energy (ft lbs) 1303 1002 761 568 416 300
Trajectory (in) -1.5 1.4 0 -7 -21.6 -46.4
20" Bushmaster® XM15-E2S 1:7" Muzzle 100 Yards 200 Yards 300 Yards 400 Yards 500 Yards
Velocity (fps) 3319 2911 2540 2197 1882 1599
Energy (ft lbs) 1345 1035 788 590 433 312
Trajectory (in) -2.5 0.8 0 -6.3 -19.8 -43.2
Firearm:
DPMS AR-15
Barrel:
16"
Twist Rate:
1:9
Substrate Material Total Penetration Max Cavity Depth of Max Cavity Initial Penetration Retained Weight Retained Percentage Expanded Diameter
Bare Gelatin scale 17" 4" 5" 1" 55 gr 100% 0.5"
Steel scale 20" 4" 6.25" 0" 54.8 gr 100% 0.22"
Wallboard scale 17" 5" 4.75" 0.5" 55 gr 100% 0.22"
Plywood scale 21" 4.75" 6" 0.05" 53.3 gr 97% 0.32"
Auto Glass scale 16.5" 4.25" 4.75" 0.5" 43.8 gr 80% 0.4"
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Ballistics

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Bare Gelatin

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Gelatin: Auto Glass

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Gelatin: Wallboard

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Gelatin: Plywood

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Gelatin: Steel

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Gelatin: Heavy Clothing

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