I would say call your State Fish and Game and ask if all they are asking for with the percussion ignition is an exposed breech. There are even some inlines that fall into that catagory. For instance my Thompson Center Black Diamond XR comes with an exposed breech and you can shoot percussion caps out of it. So does my Knight Wolverine II.

You might also want to check and make sure there are no projectile requirements. Such as, are sabots allowed? If conicals are allowed are there size requirements? What are the caliber requirements if any?

Then you could make an informed decision as to the type of rifle that might best suit you..... And your right, the T/C Omega, CVA Optima, Knight Revolution, CVA Kodiak, Traditons Persuit, H&R Huntsman, Sidekick, etc... are all closed breech as are most bolt action type rifles.

If your looking for an excellent rifle that will fit the requirements without question look at a Thompson Center Hawkins and then get it in as big a caliber as you can... It will do the job and be all the hunting rifle you need. Also Lyman Great Plains rifle in .54 would fit in there for you...