SDC, this is true but....
Training reduces the chances of fumbles to near zero, if done well and often.
Did you see the shotgun finals on ESPN's Outdoor Games? The final stage was shot in 5 clay stages, and the shooter could use two shots on each if needed.Time frames were short. All the finalists were great shots,but the guy who won was stuffing shells into his auto very, very quickly.
In a crisis, we do what we did in training. Training can keep us alive, or kill us rather quickly. In older times, lots of dead cops were found with empty 38s, and empty brass clutched in their hands. They trained to empty their brass into their hands so it wouldn't have to be picked up afterwards.Just before the big switch to autos for agencies, many depts boasted cops capable of 2 second,unfumbled reloads for a revolver. The difference was proper, realistic training.
When it hits the fan, we revert to reflex and training. The symptoms of extreme adrenaline inducing stimulation give us tunnel vision, greater strength, lesser co-ordination, and so on. If we have trained to load a certain way, we'll do the same under terror inducing conditions. So let's make that training work in our favor.
Next range day, try loading a few from your SideSaddle, butt cuff, belt, wherever the backup ammo is. And realistic training will show us what works for us, and under what conditions. Again, go for precision first, then speed.
HTH...