For other carbons, I chuck up on the point's threads with a handdrill to spin it (I tell my wife it's my lap lathe
) and
carefully use a file to chamfer the shoulder of the field point so that it matches up with the insert. It only takes a tiny bit of weight off the point, not nearly enough to notice any difference in spine or shooting qualities.
I just did this for some Axis shafts with 5/16ths tips. Works very well and makes pulling the arrow out of a target a little bit easier since the hole the field point makes is slightly larger than the shaft diameter.