No recent change. Dumber than ever. 6mm, 30cal, or previously legal cartridges meeting the .357 minimum diameter/1.8" max case length regs.
This is what happens when someone buys off favors in the legislature, which has no understanding of firearms whatsoever. The bill passed mad absolutely no sense with regards to defining legal rounds, and the DNR basically threw up their hands and OK'd everything in the 2 bullet diameters covered by the "cartridges" in the bill.
Like it or not, at least the previous regs were consistent with the intent to limit bullet over travel. The new ones make absolutely no sense whatsoever, for any purpose.
Personally I see more negatives than positives to the new regs. Few areas in IN you really need a rifle available by the new regs. Lots of potential for yahoos flinging rounds in highly hunter dense and house dense areas. In my current country this year we've had three incidents of high power rifle shooters hitting houses, none of them were "pistol caliber" rounds legal for hunting last year.
Yes, I'll be out with my 243AI this fall, per new regs. But I'll be using appropriate bullets unlikely to over-travel, and I'll most likely hit what I'm aiming at. The neighbors to the south already flung bullets past some of us around them with the prior "pistol calibers". Now I'll back up another 200-400 yards from that property line. Probably sit in the bottom of a ditch or behind a dirt berm dug out of a ditch.