NORD said:
How does that patenented breech work? I have never heard of it before...
If you googled it up I'm sure you'd find a better explanation, but it was initially designed way back in the 1700-1800s by a guy called 'Nock' if my memory serves me well.
At any rate, it's an internal design of the breech plug intended to promote faster ignition, and keep fouling from plugging the vent area.
TC (& Lyman, etc) use a modified version of Nock's patent breech...they don't really have a distinctive "ante-chamber" like Nock's design seems to have had, but rather, the top of the breech plug hads a tapered hole in the middle only about 2/3 the diamenter of the bore, that extends down 1/4" or so...a cleaning jag stops on top of the patent breech by contacting the edge all around the inside of the bore, preventing fouling from being pushed down into it.
Then that hole rapidly tapers smaller to a channel about the size of a .22-.25cal bore brush...the vent intersects this tapered tunnel.
I can't say it improves ignition because the only rifles I have all have patent breechs so I have no comparison, but I can say that ignition is outstanding and nothing I even think about wanting to improve.
However, I can speak to the cleanliness of a patent breech...I NEVER get fouling down there and I shoot a lot...ie: soon after buying a couple of vent picks that I was told I would surely need, I've never had to use them, finally quit carrying them, assume they're at the bottom of my shooting box.
I know people should "never say never", but as honestly as I can say so right now, I'd never own a muzzleloader without a patent breech...if for no other reason than the lack of fouling so there is clear, consistent ignition each and every time.