Same performance as modern hunting rifle. Nonsense. An inline with a 245 grain sabot with 100 grains of powder muzzle velocity is slower than a .54 cal 230 patched ball with 100 grains of 2 or 3f powder by a good 250 fps. Modern hunting rifle. Neither is in the ballpark. I have all three. They aren't even close to a 30.30 let alone .308, .270, or 30.06. A 26" barrel firing a 230 grain projectile powered by 100 grains of powder does not care whether the barrel is attached to a Hawken stock or a TC Triumph. The advantages are in the speed breach, cleaning, removing unspent rounds, and sights or optics. Not performance. Inlines are only like modern rifles in that they are set up to mount better optics. A 50 cal 26" barrel inline without a scope is no better than a 50 cal 26" barrel hawken in the hands of the average hunter.
But I can agree that if it is primitive then it should be original style cap and ball or flintlock. If it just says muzzle loading then inlines are included. Get the wording of the laws changed or get a separate season.