I agree with Joe. Never have I ever had a problem with the ante chamber.
Of course, I always clean with a good bore solvent (Ol' Thunder) and slosh it back and forth quite a bit.
I have no idea how much I have shot, but I would guess that I have used my body weight in Ffg powder over the years. I used to shoot a LOT.
I used to keep all the cans, but ran out of room to store them, so I quit that.
I never used a little rounded scraper or a .30 caliber brush either. I do use a flat scraper on my flintlocks, but that's a whole different story.
Of course, as the saying goes, YMMV.
John (Bigsmoke)