Life would be easier if you had the bullet comparator set also. It's not 100% necessary but it allows you to measure the bullet ogive (caliber diameter) rather than the tip so you can set any bullet to the same distance from the rifling no matter the length of the bullet or shape of the tip.
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.