I have done some testing with CFE223. Here is a link to my post on TFL showing velocities at different loads of CFE223 and standard vs. magnum primers. http://thefiringline.com/forums/show...ghlight=cfe223
The CFE223 really did keep the copper fouling to a minimum. After fireing the rounds for this test, I cleaned my bore with Barnes copper remover and only needed one patch. Normally it takes four or five wet patches and some heavy scrubbing to to get the copper out of my barrel!
I didn't have a good day for accuracy, but I am going to work some loads with CFE223 if it ever cools off! 90+ degrees around here makes it hard to sit at the range!