Found this on Reddit Credit to GM556
Im just reposting because i think this info might be useful for most of us. Thanks again GM556!
UNSC WEAPONS
Magnum
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Ammo Capacity: 12 rounds per magazine, up to 48 rounds in reserve, semi-automatic - Shield Damage: 4 shots to break shields, - Body Damage: 3 body shots or 1 unshielded headshot to kill - 3 shots then a melee to kill a fully shielded playerAssault Rifle
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Ammo Capacity: 36 rounds per magazine, up to 216 rounds in reserve, fully automatic - Shield Damage: 9 shots to break shields - Unshielded Damage: 6 body shots or 3 headshots to kill - 6 shots then a melee will kill a fully shielded playerBattle Rifle
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Ammo Capacity: 36 rounds (12 3-round bursts) per magazine, up to 108 rounds (36 3-round bursts) in reserve, 3-round burst (if you couldn’t tell by now) - Shield Damage: 11 shots (3.66 3-round bursts) to break shields - Unshielded Damage: 6 body shots (2 3-round bursts) or 1 single headshot to kill - 6 shots (2 3-round bursts) then a melee will kill a fully shielded playerNOTE: If the last round of the 4th burst against a fully shielded player must strike the head for the famous 4-burst kill.
SMG -
Ammo Capacity: 60 rounds per magazine, up to 360 rounds in reserve, fully automatic - Shield Damage: 9 shots to break shields - Unshielded Damage: 6 body shots or 4 headshots to kill - 6 shots then a melee will kill a fully shielded playerDMR
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Ammo Capacity: 15 rounds per magazine, up to 45 rounds in reserve, semi-automatic - Shield Damage: 4 shots to break shields - Unshielded Damage: 2 body shots or 1 headshot to kill - 2 shots then a melee will kill a fully shielded playerSAW
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Ammo Capacity: 72 rounds per drum, up to 216 rounds in reserve, fully automatic - Shield Damage: 9 shots to break shields - Unshielded Damage: 5 body shots or 3 headshots to kill - 6 shots then a melee will kill a fully shielded playerShotgun
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Ammo Capacity: 5 shells in internal magazine, up to 15 shells in reserve, pump action, shells are loaded one at a time - Un-scoped Red Reticle Range: 8.25m, 1 blast will result in anything between shields removed and 1/2 health damage to an instant kill - Un-scoped Instant Kill Range: <8m - Smart-scoped Red Reticle range: 10m, 1 blast will consistently remove a player’s shields and deal 2/3 total health damage - Smart-scoped Instant Kill Range: <9mNOTE: Any performance past the given distances will be inconsistent at best due to the RNG of the shot pattern. Getting as many individual pellets to hit the target from a single blast is paramount to good results.
Hydra -
Ammo Capacity: 6 rockets per cylinder, up to 18 rockets in reserve, semi-automatic, rockets loaded in one at a time - Direct Hit: 2 direct hits needed to kill - Splash Damage: An indirect hit hill remove less than half of a player’s shields. Furthest extent of damage at 5mNOTE: Rockets will only track once a lock on is attained in smart scope. Wait for the orange dotted diamond to become a solid red diamond to fire. Rockets can be curved around obstacles if the Hydra is aimed to the side of a target before firing
Railgun -
Ammo Capacity: 1 rail per charger, up to 13 rails in reserve, single shot, 2-second minimum charge time, 3-second maximum charge time - Direct Hit: Instant Kill - Splash Damage: An indirect hit hill remove a player’s shields and deal roughly 2/3 health damage. Furthest extent of damage at 4.25mSniper Rifle
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Ammo Capacity: 4 rounds per magazine, up to 16 rounds in reserve, semi-automatic - Shield Damage: 1 body shot to break shields, 1 headshot kills a fully shielded player - Unshielded Damage: 1 body shot or 1 headshot to kill - 1 shot then a melee will kill a fully shielded playerRocket Launcher
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Ammo Capacity: 2 Rockets per clip, up to 4 rockets in reserve, semi-automatic - Direct Hit: Instant Kill - Splash Damage: 4.5m instant-kill radius. Furthest extent of damage at 8m.Spartan Laser
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Ammo Capacity: 100 Battery Units, 25 Units per shot, 4 shots total, 3-second charge time before firing - Direct Hit: Instant Kill - Splash Damage: 2m radius splash damage. Splash damage does roughly 2/3 of a player’s shield. If a player has less than half of their shields, splash damage will be enough to kill them.