In the (semi) canonical "Aliens" novels, it was explained that the 10mm pulse rifle cartridges are longer, lighter, and higher-velocity than the 10mm pistol rounds fired by the Colonial Marines' sidearms, even though the projectile widths are the same. One of the books - I can't remember which - specifically said that the 10mm pulse rifle and pistol ammo were not interchangeable.
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Cry "Havoc," and let slip the hogs of war.
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