Here's the news article:
http://www.greensburgdailynews.com/...82c926b-b599-5891-ab77-07ed756f6074.html

Here's a link the Natural Resource Commision website:
http://www.in.gov/nrc/

Here's a link to the actual proposed rule change. This does not just deal with rifles, it's all rules.
http://www.in.gov/nrc/files/lsa14453_proposed.pdf