Board Thread:Warhammer 40k General Discussion/@comment-25618639-20141214213749/@comment-8881468-20180220092818

You are exxagerating with the kilometer size shells...10-20 meters, yes, but not a kilometer, not if your battleships are 5-10 kilometers long themselves.

The problem with fodder: field enough an people run out of shells and energy, The galactic imperium simply does not have the manppower to hold things (aside from generally only fielding direct line of sight weapons and no ballistic curve (aka cannot shoot over a hill)