Jorge, It is muscle memory, just muscle memory. Practice enough and you can load one on the run! In fact, I did just that before taking my 1895 .405 to RSA to hunt buffalo.
I went a bit overboard with practice because before I practiced loading without looking, I tried to reload while following a spooked Nilgai and messed up. We had to stop while I dug jammed .405 cartridges out with my knife, all while my PH looked on. After that it occurred to me such a fubar could be fatal if hunting DG.
Practice, practice, etc.
CRS, NRA Benefactor Life Member, Whittington Center, TSRA, DWWC, DRSS Android Reloading Ballistics App at http://www.xplat.net/
