See the second half of my post above, do that. Viola. You're done.
The downside is that it has to be redone for every bullet type. With the comparator, the ogive is the ogive is the ogive. All bullets seated with a certain head-to-ogive length will be the same distance from the rifling.
Still happily answering to the call-sign Peetza.
You do not HAVE a soul. You ARE a soul. You HAVE a body.
He is no fool who gives what he can not keep to gain what he can not lose.
-Jim Eliott, paraphrasing Philip Henry.