High precision cartridge for long range sniper application. Loaded with Sierra MatchKing bullets, the .223 REM HPBT 77 gr is designed for use in sniper rifles, as well as conventional weapons.
| Normative reference | ANSI/SAAMI Z-2299.4 – 1992 |
| Projectile type | HPBT |
| Projectile weight | 4.99 g – 77 gr |
| Watertightness | Yes |
| Service temperature | -20°C to +40°C | -4°F to +104° |
| Safety temperature | -54°C to +71°C | -65°F to +160°F |