300 Whisper case dimensions

[kdiver58]

I was looking at this pdf file and am not sure what the .306 (7.77mm) dimension is showing. Is the 1.076 dimension good?

http://www.accuratepowder.com/data/PerCaliber2Guide/Handgun/Standarddata/30Cal(7.62mm)/300%20Whisper%20page%2076.pdf

[Pitt300]

That is the inside width of the mouth of the case after it has been sized & prior to the insertion of a .308 bullet.