The deck gun in GWX tends to have that pyro effect. I often inflict fatal secondary explosions with a 'lucky' round. Normally I can sink a ship with 4 or 5 rounds. With destroyers it's often less. For example, i was attacked by a corvette that was on the convoy flank (spotted me coming up around the side). He charged me and I ran, firing back with my deck gun at a long range. I was lucky to hit him, but the shot that landed blew up the bridge and set of other secondary explosions. He was massively ablaze all down the hull, and turned and fled.
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