Shields do not affect ballistics. They go right through to the hull, and if that hull is not military, you should expect it to cough and die in just an instant under the HH's guns. Hull and armor are the only defense against ballistics.
You can see this prejudice for military designs v civilian all across the game despite armor is not implemented yet. For instance, look here:
Web application for planning and comparing loadouts of Star Citizen ships with detailed component breakdown and summary statistics.
hardpoint.io
Compare the Vanguard Hoplite, with hull 26,800 and shields 14,584 against the Cutty Black with hull 3,880 and shields 7,292. This is the kind of difference CIG intends for the game, and why I am always urging people to keep in mind the difference between civilian and military designs when it comes to combat. Yes, you can use a luxury yacht in combat, but no, it's generally a very bad idea against a military design.
IMHO.