Subtracting 1.007 to get your COAL is not correct. The comparator measures off of the ogive, not the tip. You do not have 1.007" of the bullet inside of the comparator.

Do not worry about book max OAL in a bolt or single shot gun. Let your gun and magazine determine that. As a general guideline, most folks like to seat bullets so at least a caliber is in the case. In your case, that would be at least .308 of the bullet in the case. Other than that, stick them out as fasr as you want as long as they fit in your magazine, cycle and fit in your chamber.