No, a round is a charge of ammunition for a single shot (Hyperdictionary) = a cartridge ? ; chambered here means in the compartment where you put the cartridges/bullet. On the whole, it says that the gun was fully loaded and ready to be fired.
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Anonymous <>She could not honestly recall if the safety was on or off. What she did know was that a round was already chambered. Once the safety was off, a tap on the trigger would fire the weapon.
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