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Sauron is on the mark. The guns have differing damage so that their PVP balance and sieging balance are separate. Those numbers are still accurate.
The actual time it takes a single heavy battleship to siege down a Core 4 would be 11 vulnerability periods, each taking the full two hours - so 22 hours, not 85 minutes.
There's some changes in the pipe in regards to both defense module efficacy against large groups and the amount of healing vs HP levels of bases, as right now it's definitely slanted a bit too hard toward siegers.