RE: Distance To The Lands.......I don't get it!
Every bullet has a different curve to it, causing it to touch the lands at different lenghts. If you were to draw a profile of each bullet, you would see the difference in the curve, and how one could go farther into the chamber than another bullet might. I really can't think of any other way to describe it, but I do know that my Nosler Partitions, and Sierra Gameking HPBT, and SPBT touch the lands at three different lenghts. Hope this helps.