[Unclenick]

The lands touch down where the ogive (sides of the nose) departs from the bearing surface (the cylindrical portion of the bullet that fills into grooves of the rifling). A long pointy nose shape will stick forward a lot further than a short round nose bullet when both are seated to touch the lands. The pointy shape will therefore have a longer COL when the two fit into the chamber with the same amount of extra room. So COL's don't tell you about chamber fit except for working with a specific bullet and your particular chamber.

QuickLOAD says your greater seating depth with the Speer will raise pressure about 5000 psi. This is equivalent to about 2.5 grains of H414, so I would lower the charge by at least that much and work back up in steps no greater than .5 grains, watching for pressure signs, to see if you can safely use the 40 rounds loaded with the full charge?