If you look at EOD’s drawing, you see that the middle section of the projectile body is practically cylindrical with 34.98 mm diameter at the front (110 mm below the nose) and 34.94 mm at the beginning of the boattail (the rear part).
The part in front of the cylindrical section shows a shrinking diameter until it reaches the flat nose (called meplat) of only 4.8 mm diameter. At first sight it looks like a truncated cone, but it really isn’t. If you put a ruler alongside the outer shape of the projectile (110 mm line to meplat) you see that its not straight but curved. As a matter of fact, it is a segment of an ordinary circle. It is the dominating element in projectile design.
In this case, the circle has a radius of 408.47 mm. The center of the circle is located 110 mm below the meplat and 390.98 mm to the right/left of the center line of the projectile (408.47 mm minus 17.49 mm projectile radius).
As soon as you start to model the projectile shape for printing it in 3D (or make a drawing for a machinist), you will see the above numbers falling into place.
The name “ogive” actually come from architecture. If you look at a gothic cathedral, for example, the typical windows of that style have a pointed top. The window top shapes are also created by using circular lines as construction elements.
P.S. Writing this response I noted that the end diameter of the boattail is also missing from the drawing. It seems to be about 30.9 mm, comparing it to the 34.94 mm line. (Interpolating dimensions from drawings this way should never been done in serious work, by the way.)