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riverwalker76,
He is referring to marking the bullet with a sharpie marker, then chambering it where as the lands scrape off the marker from the bullet. Doing so he is locating his max OAL for that particular bullet.
I have done the same thing many times. However there are a couple of fine points being left out. If you do this with a fully sized case, the neck tension will give you a false reading and sometimes even a stuck bullet. The best way is to split the neck of the case after it has been sized using a Dremmel tool and thin cut off disc. After cleaning up the burrs then set the bullet which now has the freedom to move in the case as it is slid into the chamber and the bolt closed.
Is it the best method out there, nope but it will work in a pinch. Heck I have even used a bullet smoked with a match to accomplish the same thing years ago.
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