The HE DPM above is provided with 21mm of Pen. Outside of Superstructure hits, the only things that effects is downtier'd Cruiser armor and Destroyers.
Comparing 315,000 DPM filled with shatters and fire change to 403,200 DPM with 36mm Pen is a massive difference.
While there can be ricochets, the chances of shattering are greatly reduced as 36mm pens Tier 10 Heavy Cruisers with 30mm and even the 32mm base plating of Battleships. A French or British Battleship is full pen'd everywhere as they are coated only in 32mm.
The DPM can kick up higher as well.
Pen damage deals 33% of rated damage (prior to saturation). Base firing rate could deal 134,000 damage to a ship in a minute, the MBRB can tack on an additional 30k. Even Saturated, that is an immense amount of damage in a minute.
Further, the more comfortable shell flight aids that as compared to an Atlanta.
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