You would also have to compensate for the convergence zone (if your cannons are outboard like in a Spit or BF109E-3) at 800yds. The game default is 300 yds, so the point where your cannons actually hit at 800yds would be well to either side of your cross hairs. I don't know about realistic mode though, is there automatic correction for guns in that? Also cannons have relatively slow rates of fire, I'm sure its possible, but it would be a pretty good shot.
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