Kraigwy - yes, they do teach such. I took a class on that with Karl Rehn. To prepare, I broke my dominant hand wrist and had to do it one-handed with my nondominant hand. It was quite fun. Steve Moses' classes went over it also.
It also convinced me that unchambered carry was quite silly - not to start that debate again.
In Claude Werner's snubby class, we did onehanded reloads.