Hornady Frontier 5.56 NATO 55 gr FMJ (M193) is a high-volume rifle load built around a 55-grain full metal jacket projectile, intended for consistent feeding and repeatable ballistics in modern 5.56 NATO–chambered rifles.
 
Key Features
M193-style 55-grain FMJ – Full metal jacket bullet profile supports reliable cycling and predictable point-of-impact shifts typical of 55-grain ball ammunition.
5.56×45mm NATO loading – Designed around 5.56 NATO chamber standards; verify firearm chamber markings before use.
Non-steel core, range-friendly bullet – Lead-core construction helps meet many “no steel core” range requirements.
Brass-cased construction – Brass cases are designed for smooth extraction and consistent chamber sealing.
Military-grade component approach – Uses boxer-primed, centerfire construction with component selection aimed at uniform ignition and function during extended strings.
 
Specifications
Model number – FR2015.
Cartridge – 5.56×45mm NATO.
Bullet weight – 55 grain.
Bullet type – Full Metal Jacket (FMJ), M193-style.
Test barrel – 20 inches.
Listed muzzle velocity – 3,240 feet per second (varies by firearm and barrel length).
Listed muzzle energy – 1,282 foot-pounds (varies by firearm and barrel length).
Case material – Brass.
Primer type – Centerfire, boxer-primed.
Rounds per box – 150 cartridges.
 
Competing Items
Federal 5.56 M193 55 gr FMJ – Widely used 55-grain M193-pattern training and general-purpose load.
Winchester 5.56 M193 55 gr FMJ – Comparable 55-grain ball-style option for range use.
PMC X-TAC 5.56 55 gr FMJ – Similar 55-grain FMJ training load with 5.56 NATO formatting.
IMI 5.56 M193 55 gr FMJ – Another mainstream M193-pattern alternative in the same role.
 
Hornady Frontier 5.56 NATO 55 gr FMJ (M193) is a straightforward 55-grain ball-style load geared toward dependable cycling, consistent ignition, and repeatable training performance in 5.56 NATO platforms. The 150-round box format is suited to high-round-count range sessions where uniform function matters.