12.7x40mm

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*There is no such thing as a "Semi Armor-Piercing" bullet in modern firearms; rounds are either AP or not. Semi Armor-Piercing may mean that the round is capable of penetrating only light body armor.

*Since the game specifies that the M6D, the pistol that fires this cartridge, is 26.7cm long, the actual rounds it should handle are actually 9 or 10mm, to actually being capable of firing 12.7 rounds, the pistol must be 33.39cm long making very bulky, just about the size of a machine pistol or submachinegun, and is probably only suitable for Spartans and not marines.

*In Halo, if you look closely at the ammo packs for the Pistol, you'll see that there is a typo on the bitmap, it says 'HP'rather than 'HE'.

==Sources==

12.7x40mm: Difference between revisions

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 *There is no such thing as a "Semi Armor-Piercing" bullet in modern firearms; rounds are either AP or not. Semi Armor-Piercing may mean that the round is capable of penetrating only light body armor.
 *Since the game specifies that the M6D, the pistol that fires this cartridge, is 26.7cm long, the actual rounds it should handle are actually 9 or 10mm, to actually being capable of firing 12.7 rounds, the pistol must be 33.39cm long making very bulky, just about the size of a machine pistol or submachinegun, and is probably only suitable for Spartans and not marines.
+*In Halo, if you look closely at the ammo packs for the Pistol, you'll see that there is a typo on the bitmap, it says 'HP'rather than 'HE'.
 ==Sources==