McMiller's is not a bad range, I have a yearly pass there as I live somewhat close. They changed ownership a few months ago and now seem to be mostly set up. A yearly pass is $200 for one person or $400 for a family pass, which allows 4 people. Both cover up to the 100 yard range, getting a pass for that covers the 300 yard range is more. I'm not sure what the normal rates are now, but last time I checked I think it was $15 for an all day pass which covered up to the 100 yard range. I don't know of any other ranges within reasonable distance of Mukwonago that are as cheap or offer as much variety as McMiller's. FFL-wise, McMIller's does have a FFL now as well, although the transfer fees have gone up to $50 now with the new ownership, whereas it used to be around $25 or so I believe. They now allow silhouette targets (they didn't up until maybe about 8-12 months ago), but they still have a one-shot-per-second rule, although I see that enforced to various degrees depending on the RSO present and number of people on the range.
http://www.mcmillersportcenter.com/