The rule (10.5.9) specifically calls out loading, reloading, and unloading. Definitions copy pasted below (unloading not relevant to this discussion). At the time you lower the hammer, you are not loading or reloading the gun.
Loading:
The insertion of ammunition into a firearm. Loading is completed when ammunition is inserted, firearm is in battery (slide forward or cylinder closed and ready to fire), and the competitor’s hand has been removed from the magazine or other loading device (except as may occur during establishing a normal grip on the firearm)
Reloading:
Revolver -Empty the cylinder, insert new ammunition, and close the cylinder or loading gate. Self-loader -Remove magazine, insert a different magazine, and return the firearm to battery (slide closed), and the competitor’s hand removed from the magazine. For the purposes of this definition, a magazine/speed-loading device retrieved from the range floor is considered a new source of ammunition.