I'd guess that your best bet is the USPSA/IPSC club just West of Milwaukee in Oconomowoc:
OCONOMOWOC SPORTSMANS CLUB
Section: WI Area: 5 Club Number: WI08
MARK RICHMAN
WAUKESHA, WI 53186
Home: (262) 524-5508
Work: (262) 886-3630
Email: mrichman@tricore.com
For IDPA call Mark Gehl at 262-306-7903 in Hartland.
If you are willing to drive some, there is a USPSA Club in Appleton that shoots every Monday night and an IDPA club in Ripon. You can find more info on these by going to www.uspsa.org and www.ipda.com and using their club finding features.