I can rack the slide on my M9 with one hand as long as I have a solid edge to push the rear sights against.
Like the edge of an open car door for example, or even a table or a chair.
I like having 16 rounds handy, as the first couple of shoots will leave the shooter temporarily night blinded and deaf in a dark environment from the muzzle flash and the loud bang the round makes when the firearm is discharged.
I’ve done a little training in a dark environment, and you can’t see or hear for a a while after firing off a couple of rounds and leaves one a bit disorientated, especially after firing a .357 or .44 Magnum.
That’s risky, not 100%. If you short stroke it you can end up with an empty chamber.