I got my Accura (goose neck) Nitride several months ago and found it to really be a joy to shoot and clean... the breach plug was one of the main reasons because it was so easy to take out and put back in.
I tried several different Power Belts with the same two pellet IMR White Hot load at 50, 100, and 200 yards... I shot 30 times or so that day and only cleaned the breach plug once,,, not because I had any ignition problems,,, but because I wanted to make sure the groups would be as accurate as possible.
Sure there was a little blow by, but not a lot considering the number of shots. All in all, and I have owned quite a few muzzleloaders over the years, I think the CVA Accura is one of the best I have ever shot.