I noticed on this boolit the GC shank is labeled 384-381, does that mean it is tapered? also I have read on sages that the 416 gas checks are made for a GC shank diameter of .393. I also noticed they had 2 other gc's labeled for .41 cal, would any of these fit or would I need to have the gc portion of the mold reamed out? or is this something I can ask noe to do? thanks a lot-Travis