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Reloading of this particular weapon is tricky. It has a six chamber cylinder design similar to a revolver, but is utilizing clamps instead of solid chambers and a gas operated rotation.
When tapping "reload" button, Artyom loads one shell and cocks the gun. After that he can load four more shells out of remaining five since the lower clamp is blocked. After firing off three rounds, Artyom has to manually cock the gun again and chamber the next round to overcome the gap left by the empty clamp.
When holding "reload" button, Artyom loads four shells into available clamps, cocks the gun and loads the remaining two.
Reloading can be interrupted at any point. Likewise empty clamps can be loaded at any time unless they are blocked by the mechanism.
Dropping the weapon by picking up any other secondary weapon will empty all clamps and reloading can be repeated from scratch.