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while 155mm cannons in the real world have ranges of 20 miles or more.

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When you said that I did not believe it because a WWII 16 inch naval gun, 406mm, had a range of about 25 miles. From what I have found is that you are exaggerating by only a little bit. From what I have found is that the maximum range of a 155 Artillery gun is 30km or 18 miles. There is a 155 Artillery gun and ammo that is under development that would have a planed maximum range of 47km or just under 30 miles.

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Since 1982, the South Africans have had an operational 155mm artillery piece with an unassisted range of 39km, or 53km using shells with base bleed to reduce drag.

http://en.wikipedia.org/wiki/G5_howitzer
http://en.wikipedia.org/wiki/GC-45_howitzer

It's interesting what range enhancement a few tricks in shell aerodynamics can achieve.

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