Bolt pistol?

While I love the bolter, the fact that it takes forever to ready makes it a bugger to use, especially as a zealot. Wouldn’t a bolt pistol make more sense for the zealot?

I understand the long ready time in terms of balancing for the bolter, but the animation makes zero sense. Why would you prime an empty gun? Even worse, why would you waste a round by cocking it with one in the chamber??