M634 Experimental High-Powered Semi-Armor-Piercing: Difference between revisions
M634 Experimental High-Powered Semi-Armor-Piercing (edit)
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Introduced along with the BR55 Battle Rifle as an improvement over the standard 7.62x51mm assault rifles in the UNSC's inventory, this intermediate round provides good accuracy, controllability, and effectiveness against most Covenant personnel. Unlike most ammunition types in the Halo games, this is not a real-life ammo type. | Introduced along with the BR55 Battle Rifle as an improvement over the standard 7.62x51mm assault rifles in the UNSC's inventory, this intermediate round provides good accuracy, controllability, and effectiveness against most Covenant personnel. Unlike most ammunition types in the Halo games, this is not a real-life ammo type. | ||
==Physics== | ==Physics== | ||
The 9.5mm cartridge's performance is consistent with other special-purpose rifle calibers, offering high power and accuracy in close-combat engagements. The maximum effective range of the BR55 Battle Rifle against energy-shielded targets is around 200 meters. This is fairly limited compared to most modern 7.62x51mm Main Battle Rifles, which leads us to believe that the 9.5mm cartridge is a special medium-velocity, medium-mass round of approximately 200-220 grains/13.0-14.2 grams weight, traveling at a velocity of around 1,800 to 2,200 fps/550 to 670 m/s. In a rifle weighing anywhere between 8.5 to 11 pounds, this would produce manageable felt recoil that could be placed somewhere between that of the modern-day AK-47 and a full-power rifle such as the FN FAL, with a muzzle energy of around 3,200 joules, although it is only an estimation based on the width of the cartridge and how many rounds it takes to kill an opponent. For reference, one 14.5x114mm round from the SRS99C-S2 AM is equal to around 30,000 joules of muzzle energy, and since 2,500 joules times twelve rounds equals 30,000, it follows that each round from the BR55 possesses more energy than a 7.62x39mm round, but less energy than a real-world 7.62x51mm round. | The 9.5mm cartridge's performance is consistent with other special-purpose rifle calibers, offering high power and accuracy in close-combat engagements. The maximum effective range of the BR55 Battle Rifle against energy-shielded targets is around 200 meters. This is fairly limited compared to most modern 7.62x51mm Main Battle Rifles, which leads us to believe that the 9.5mm cartridge is a special medium-velocity, medium-mass round of approximately 200-220 grains/13.0-14.2 grams weight, traveling at a velocity of around 1,800 to 2,200 fps/550 to 670 m/s. In a rifle weighing anywhere between 8.5 to 11 pounds, this would produce manageable felt recoil that could be placed somewhere between that of the modern-day AK-47 and a full-power rifle such as the FN FAL, with a muzzle energy of around 3,200 joules, although it is only an estimation based on the width of the cartridge and how many rounds it takes to kill an opponent. However, because Halo is in the future, it probably has a more advanced powder, resulting in a higher muzzle velocity. Unlike modern rifles, its bullets in game are untracablly fast, meaning it probably has a speed of 1250 meters per second or higher. For reference, one 14.5x114mm round from the SRS99C-S2 AM is equal to around 30,000 joules of muzzle energy, and since 2,500 joules times twelve rounds equals 30,000, it follows that each round from the BR55 possesses more energy than a 7.62x39mm round, but less energy than a real-world 7.62x51mm round. | ||
Ironically, this makes for a bit of an inconsistency regarding damage ratios of the powerful 7.62x51mm round versus the 9.5mm. In ''[[Halo: Combat Evolved]]'', it takes 16 direct headshots at close range to kill an opponent with the MA5B. Compare this with 12 rounds (four bursts) from the BR55. If the UNSC's weapons were to conform to real-life ballistics, each individual 7.62x51mm round from the MA5B Assault Rifle would actually do over 37% ''more'' damage and remain effective at much longer ranges than each 9.5x40mm round, at the expense of very poor controllability on fully-automatic fire. | Ironically, this makes for a bit of an inconsistency regarding damage ratios of the powerful 7.62x51mm round versus the 9.5mm. In ''[[Halo: Combat Evolved]]'', it takes 16 direct headshots at close range to kill an opponent with the MA5B. Compare this with 12 rounds (four bursts) from the BR55. If the UNSC's weapons were to conform to real-life ballistics, each individual 7.62x51mm round from the MA5B Assault Rifle would actually do over 37% ''more'' damage and remain effective at much longer ranges than each 9.5x40mm round, at the expense of very poor controllability on fully-automatic fire. | ||