No place i know. Racine county line has a 600m but i belive its private. Theres also a 1000m somewhere around Madison not sure what its called. Ive never heard of a place to borrow a rifle though in wisconsin.
A little late but Lodi has a 1k range.
I've never been there but my gunsmith has shot there.
I shoot at the Daniel Boone Conservation League just north of Milwaukee,but our silhouette range is the longest at 200 meters. If you want to shoot steel with a handgun send me a pm and you can use something of mine.
Best bet to shoot long range is to link up with a buddy up nort that has farm land and construct your own range. Done it with one friend out to 800... and planning on doing it with another out to 1500 (yards)
But yeah from being out of the country thats unfortunetly not an option. Im thinking about getting together a group shoot sometime in the future it would be fun.
There is a county park that is range by Mosinee that is nice. Down here in Dodge county I am a member of a club that has a 50,100, and 200 yard range. I would like a place to shoot farther if anyone has one.
Twin citys in the Appleton area has a few stations that are around 300-350 or so. I haven't been there personally, but my friends have. Waushara Co. range is free and goes to 200. That's where I go when I'm in a pinch.