You will be immediately able to run again (without the ranger perk, you'd be slowed to a crawl whilst reloading), and what's even better, once the crossbow is reequipped, it will be magically loaded and ready to shoot again.
Take aim, fire, and quickly double-tap the crossbow hotkey (it also works with the hotkey of a different crossbow, which you will soon see is the cornerstone of this build). Go into your inventory and hotkey your crossbow.
My Undead Hunter however is not only inspired by the demon hunter, but seeks to emulate it as much as possible, which is made possible by a major programming oversight which I will now explain. Before we get started, I need to point out that this build is inspired by the extremely popular Demon Hunter build on this site, although it bears no resemblance other than the fact that the Undead Hunter is also primarily a crossbow wielder that eschews sneaking (for much the same reasons expounded in that build) and is based on the Diablo 3 demon hunter class.