Not really a concern as one handed reloads on a semi are easy enough and much quicker than a revolver, as with anything though you need to practice.
The semi auto is generally easier to reload then a revolver...
Doing a tactical reload with a semi auto (replacing a partially or fully depleted magazine with a full magazine, while the slide remains in battery with a round chambered) is, with practice, easy and fast. During the magazine exchange, you still have a round in the chamber, ready to fire.
With a revolver, any reloading takes the weapon out of action while the cylinder is reloaded.
Also, a tactical reload with a revolver conducted by topping off a partially depleted cylinder with fresh rounds could be difficult with one hand. This type of load would preclude use of a speed loader (if extra rounds were carried in a speed loader, one would have to release these into the hand first, and then load single rounds as desired).
The alternative revolver tactical reload would be to eject whatever was in the cylinder (including unfired rounds) and then reloading (preferably with a speed loader). The gun is out of action momentarily. Also, unless retrieved, any ejected live rounds would be lost.
The emergency reload of a semi auto (where the pistol has been shot empty) is likewise easy and fast to accomplish one handed, with practice, PROVIDED THE SLIDE IS LOCKED TO THE REAR AND THE SHOOTER CAN OPERATE THE SLIDE RELEASE CATCH WITH THE SHOOTING HAND.
Where one handed reloading with a semi auto gets tricky is in the case where the empty pistol's slide, for whatever reason, is in battery and NOT locked to the rear.
In that case, after a fresh magazine has been inserted, the shooter must find a means of cycling the slide manually to chamber a round. This requires hooking the rear sight on something and pushing the pistol against that, so that the frame moves forward while the slide remains on place, still hooked by the sights against something, such as the edge of a belt or holster. The design of the sights will effect whether this is doable or not. For example, Novak's low profile carry sights, with their wedge design, would not lend themselves to this technique. In this instance, a revolver would be easier to reload one handed.
Of course, the generally higher ammo capacity of the semi auto might make the necessity of a reload less likely.
The key is to know your equipment, then plan and prepare for contingencies, with knowledge of the capabilities and limitations of your weapon, your accessories and yourself.
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