So what you're saying is I should just stick to Necrochasm? Okay then! Got it! I'll stick to Necrochasm.I can do this later for serious but basically after firing: hit reload and then immediately sprint forward one step. You should now be able to shoot again, essentially giving you a slight increase to rate of fire. This only works if you have reserve ammo, otherwise you can only cancel the animation but will still have to wait the same amount of time until you can fire again.
This takes a lot of practice so that it becomes reflexive (or at least it did for my relatively old brain).
Or you can just use it the old fashioned way (and be doomed).