How many Blackhorn 209 shooters have that carbon build up in the plug? And how often do you have to clean that out? I mean you could shoot all day on the range right?

The reason I ask is when I tested Blackhorn 209 I used a Knight Disc Original and it worked great with the orange primers. BUT I was under the impression I did something to ruin the breech plug as after a while I started getting bad ignition. I was not even aware of this carbon build up I have read about. I now believe that is what happened to the Disc breech plug. Also the face of the breech plug was basically eaten up. But I believe the fact that I was re using the orange primer jackets and there was blow back, was causing that. And now that there is no access to Blackhorn 209 in my area... I can not test my theory again.