I was having the same issues until I neck reamed. I am using cast bullets, so they were a tad large, even with the factory crimp. In fact, I was having issues with Starline brass until I reamed the necks. The bullet I'm using is @ .311.
I kind of like tinkering with the 223 brass. Beats watching the tube.
I kind of like tinkering with the 223 brass. Beats watching the tube.