Maybe something to think about (WDS or another publisher?)

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Ok - am confused now:  is it an idea about what could happen with something being designed at about a mile a hex?

If so- you are looking at an area roughly about 1000 miles by 1000 miles, and not need all of that area - It could be bigger- but it might be wasting time to do west Texas to the middle of New Mexico, where it might be maybe shown a little differently; that gives the rough dimensions of a map (and covering all of Florida ... well, it is doable, but there is a lot of space that frankly wouldn't be used) - 1000 x 1000 is an approximate map scale (and at 1 mile per hex ... 1000 x 1000 - which is and has been doable.

I'd say though that there were some artillery that could fire further than a mile. Not many, and it is further than probably the effective range of a 3' rifle but technically 21 hexes is 2625 yards which is over a mile but not 2 miles. And there are some others that have a longer range than even that.

Looking at Boardgame Geek Roads to Gettysburg II looks to be about 87 hexes wide (58 hexes being the wide map at the bottom and a guestimate of the one turned on its side being about half width of a full map.

Anyways the point is - I think your idea of area is doable.