If it were a hot range, Then under RO command I would present the gun into my workspace, drop the mag, reholster the magless gun, adjust the mag round count, present the firearm again into my workspace, insert downloaded mag and holster. Loose rounds go in my pocket.What if the drill requires partial or empty mags?
If it were a cold range, I would stage the downloaded mag and wait for the command to load.
In other words, most of my gun manipulation requires my workspace. It is what I can control. And the presentations and reholstering adds to practice.