Are you on the Escanaba/east side? or Iron River/Watersmeet side?
Either way, the closest easy access range is the Negaunee Rod and Rifle club, just west of Marquette. It's only 600 yds. If on the east side of the lower UP, the closest 1000 yd. range is MTC in Lake city which is downstate. Otherwise, scout around at some of the highline right-of-way cuts that are isolated and you can set up ranges on those.