Been doing a little reading on this....What are you going to use for parent brass? 243 Win.? Some of the articles I've read seem to indicate that the 243 fireformed brass ends up with shorter than desireable caselength in the neck area. There is aprocedure to use '06 brass that seems to get away from this bit of a concern. Could the custom barrel not be ordered with this in mind and the cases (243 Win.) be trimmed if necessary to fit the new chamber neck dimensions, or am I assuming wrong??