Mykey,
I don' t pay any attention to the COL given in the books.
I make up a round with no powder or primer in it. I seat the bullet out aways,
then I put it in the rifle chamber and see if the bolt will close with no pressure, if not I take it out and push the bullet in a little further and try it again. As the round gets closer to chambering with no pressure I push the bullet in less each time. Eventually the bolt will close easily on the cartidge in the chamber with no pressure, then I take the cartridge out and measure it and use that for my COL. Sounds like a long process but only take a couple minutes.
I only reload for hunting so this process works for me. Tweaking the distance from the lands is not going to be the major factor in your accuracy equation, it is normally more of a fine tuning tool. If you use a combination of brass powder primer and bullet that your gun likes you will have an accurate load with any reasonable distance from the lands. The biggest factors are the bullet and powder you use. I have seen loads that shoot well under an inch do it with the bullet seated just off the lands and the same loads shoot just as well with the bullet way back from the lands (pressure experimenting).
If you try a load with H4831sc 117gr Sierra Game kings and federal magnum match primers and it doesn' t shoot well then try the 115gr Nosler ballistic tip.
If neither one of them group then your rifle may not be capable of great accuracy.

I have spent years tweaking loads for accuracy in different rifles, you can really drive yourself crazy working with too many variables. Pick one powder, H4831sc, one brand of brass (Win or Rem) one primer (Fed match magnum).
I know from experience this combination works from working with several different
25-06' s. Now your only variables are amount of powder and the bullet.
Most rifles will handle the max load from the load data books start a couple grains under that.
From my experience the 117gr Sierra gameking, 115gr Nosler Ballistic tip are generally the most accurate 25 caliber bullets that I have tried. I have tried various Barnes bullets, Partitions, Hornadys, Speers in 100 to 120grains.

Obviously I don' t know your level of experience so I may be preaching to the choir with all this info. I do not claim to be a reloading expert as lots of folks reading this can tell.
I do have lots of experience reloading with the 25-06 and searching for accurate loads, that is why I am now on my third 25-06, I finally found one that would shoot. Ruger Mark II. For what it is worth this is the process that has worked for me.
Good luck!