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south central IOWA | 6" wood for line posts?.............Wow!!---- 4 - 4 1/2" will do.
25' apart?..............Wow!!---- Hope you plan on having some steel posts in between.
High tensile smooth or barbed? If you're thinking smooth with cattle, IMO I wouldn't waste my time and effort of building the fence.
To me, you are thinking of making a high maintenance thing into an even higher maintenance thing with what you describe.
Welcome aboard. :-)
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