Come hungry if your driving to Indy from Auburn, I would think FT Wayne, has a few rental places closer than Indy.
No adult section?Parabellum in Avon does a “9mm Smorgasbord” where you can try a bunch of 9mm pistols.
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That is a pretty good ideaThe Carmel Shoot point blank has a good selection. I would try and narrow down your short list and call ahead to see what they have, or many list them on their website.
You may be able to make a trip to Indy and shoot everything you want in one or two places.
American Shooters in Clarksville has a good amount and runs specials a good bit.