I believe you'd be Ok. Your license says that you may carry any any handgun that you legally possess, you don't have to actually own it. As long as one person in the group has their LTCH they should be good as far as transporting them to and from the range goes. Once you get to the range I don't know.Without being able to quote "chapter and verse" of Indiana Code, I believe the answer is "yes."
However, in a different scenario, say your friends also brought handguns, those friends do not have carry permits, and you claim all the handguns are yours, you may put yourself in a bit of a pickle!