This pretty sums up their interpretation. If it falls within these guidelines, it's legal.
• The rifle must have a barrel length of at least 16 inches • The rifle cartridges must have a cartridge case length of least 1.16 inches • The rifle cartridge must fire a bullet with a diameter that is o .243 inches (or 6 mm); or o .308 inches (or 7.62 mm) • No cartridges with a bullet diameter between .243 and .308 are legal (such as the .270 Winchester) • A hunter may not possess more than 10 such cartridges while in the field
From Indianapolis, IN Live in Independence, KY Hunt in Vevay, IN