Nose to charging handle was the way I was taught in the Army three decades ago. I still used that in the late 80's early 90's when Aimpoints were first adopted onto AR platforms and during CQB training. I don't train that hard much anymore and varmints are more my thing so I have gotten away from that with higher power optics. But I can go back and forth between the different shooting positions. It's really not much different from going to nose to charging handle then picking up a standard bolt action rifle.
