Cannon Question help

[Dr. Zeppers]

Max out cannon shooting? Not sure what you mean here.

I personally like to max the primary cannon skill which increases firing rate. (I can do this without having to consider ANY rep penalties)
I also like to max the first passive skill that is reload speed. (also no rep penalties)

This makes lightning all the more effective being able to fire/reload much faster. Personally I start applying extra points to the various ammo types once I have the cannons mastered. I have found that lightning maxed is very helpful on Boss battles, and just about everywhere else. Fury is real cool, but often lags people out.