I use the chamber to set my resizing die. I use standard dies backed out of the cam over, full length, position. You will need to move the die in 1/64 turns to get it just right. I set them so that I get a ever so slight crush fit. I get 15+ loads on my brass, and have been doing it this way over 30 years.
I don't think you will gain any accuracy from a bushing die in a sporter weight 204. If you were shooting a bench rest rifle, you might see it.
