Welcome, from someone that went the other direction - KS to IN. At least one gun range in Wichita had an indoor 100yd rifle range. I would be suprised if none of them up in KC did as well. Also there were 100yd ranges at Lake Afton and Cheeny lake - you might check with the KDWP about the possibility of ranges at your local lakes - Hillsdale, CLinton, Pomona, etc.

We'd typically just ask around and find a farmer with rolling land (not a problem in your part of KS) for decent backstops, and just sight in at his field (though the fields might be a bit crowded the next two weekends with the pheasant and quail openers. I'm headed out to Dodge city to chase birds and mulies myself.