For those who carry with a combo rig for their firearm and spare mag, how do you do a tactical reload? Seems like you'd have to switch the firearm into your off hand, reach for your mag with your strong hand. Then fumble to get the mag into your off hand while putting the firearm back into your strong hand. That seems like a bunch of confusion or a lot of time to do all of that. I usually carry a spare mag in my off hand pocket or run a mag holder on my belt on the off hand side.
I'm not saying I'm some know it all, but I just don't see it.
Tactical reload? Do you have to be wearing a plate carrier for a reload to be tactical? What if all you could afford is a pair of 5.11 combat khakis. . does that count?
Most handgun combat instructors advise against combo holsters for the very practical concerns you mention: basically, if you can't get to your spare mag without transferring your gun to your other hand, then you don't have a spare mag.