A one handed reload is a method by which you reload a semi-automatic pistol using only one hand. It simulates the shooter being injured, and losing the use of one hand/arm.
A strong hand/one handed reload, consists of 1)dropping the magazine, 2)securing the weapon by either putting it into the holster or clamping it behind one knee, 3)withdrawing a fresh magazine with the strong hand, 4)inserting the magazine into the holstered or clamped weapon, and 5)releasing the slide.
As far as I know, there is no means of reloading a revolver one handed.
Hope that helps.
LawDog