I am considering my alternatives to producing "more accurate" loaded cartridges. I currently have a Dillon 550 with standard toolheads. I could get a second press, maybe a Forster Co-Ax (for the floating feature), or I could get floating toolheads like the Whidden's. So, I'd like to know are the Whidden heads basically drilled out holes with collars to allow the dies to move in the plane of the toolhead? If so, why aren't people just reaming/drilling out the standard heads and adding collars?