The mod I linked to gives you 250 rounds of whichever deck gun you have (88mm and 105mm).

Ive got it in my new mod list. Ive only put 4 in after patching to v1.6b with hsiets patch. That one plus open hatch mod, lite harbour traffic and lifeboats and debris and v1.6b supplement mod? Maybe i should just try them one at a time?

P.s. 250 rounds sounds perfect!