Sergeant KIRK. When I match that up with the scientific data Mr. McCamy has obtained from measuring it, this has to tilt the scales in the direction, yes, indeed it is the same rifle.
That's not to the exclusion of all other rifles. That's not even beyond a reasonable doubt.
Shaneyfelt: "I did find one notch in the stock at this point that appears very faintly in the photograph, but it is not sufficient to warrant positive identification."
Let's look at this in a bit more detail.
Kirk and Shaneyfelt are talking about a flaw on the upper edge of the stock just above the top of the finger groove. It's somewhere between 3/4" and 1" in length. The perimeter of the stock is a bit over 75".
From my own experience with a few dozen Carcanos, at least 10% have such a flaw and as many as 1/3 of them do. The probability of another rifle having a flaw like that is given by the size of the flaw divided by the perimeter of the rifle times the prevalence of Carcanos with such a flaw. Using the figures already given, we can calculate and upper and lower limit on the probability of any other rifle randomly have a matching defect,
The lower limit is given by 1" / 75" * 0.33 = 0.44%
The upper limit is given by 0.75"/75" * 0.10 = 0.1%
By this, there's better than a 99.5% --and maybe a 99.9%-- chance that the rifle in the BYPs is C2766/CE139. These are back-of-the-envelope calculations, but still it gives an idea as the relative uniqueness of the rifle in the photo.