COL, Tip or Ogive?

[.308--win]

I can under stand why not to measure to the tip on certain bullets! Lead tips get disstorted and flattened. But then different style bullets have different a shape point:

The lead tip bullet as a Ogive of .140", the BT has a Ogive of .110". This is my problem, Do I have to find the distance to the lands for each bullet? As the smaller Ogive will not seat as deep as the bigger Ogive, will it not? Or am I just totally missing something here!?!! Any help or tips will be greatly appreciated! Thanks!! (Sorry for the fuzzy pic!)

Perry

 

[RePete]

If you want to work with the ogive, you need an OAL chamber gauge and a comparator to get the answers.

These are now made by Hornady (formally Stoney Point).