Distance to lands is a bit tricky because the shape at the point where the ogive meets the shank will affect it somewhat. This is more an issue with secant-ogive bullets which have the ogive meeting the shank at an angle vs a tangent ogive that gently curves away. The front edge of the rifling for 6.5 Grendel starts out at a slope of 1.5° per side (when the barrel is new). If the ogive is at a greater angle, it will slide under the rifling land and the first contact will be the shank rather than somewhere on the ogive. One result is that the distance-to-lands is longer than expected.
FWIW, some rifles don't seem to like secant-ogives, and this is thought to be one of the reasons. For the Grendel, the tangent-ogive 120 SMK tends to work well in most rifles, but its secant-ogived brother, the 123 SMK is more hit-or-miss, no pun intended. Many VLD bullets and some Hornady hunting bullets have secant ogives. There has been a trend towards hybrid-ogives, which combine the tangent shape meeting the shank with the secant farther away, but Berger may have trademarked the term. Other bullets may have it but call it something else.
https://bulletin.accurateshooter.com/201...id-ogives/
FWIW, some rifles don't seem to like secant-ogives, and this is thought to be one of the reasons. For the Grendel, the tangent-ogive 120 SMK tends to work well in most rifles, but its secant-ogived brother, the 123 SMK is more hit-or-miss, no pun intended. Many VLD bullets and some Hornady hunting bullets have secant ogives. There has been a trend towards hybrid-ogives, which combine the tangent shape meeting the shank with the secant farther away, but Berger may have trademarked the term. Other bullets may have it but call it something else.
https://bulletin.accurateshooter.com/201...id-ogives/