I couldn’t say for sure that my estimate is even that precise. It’s just a rough estimate. That is the best I can do at this time.
Jerry posted.......
The print would be about 3/4" in dimension, whereas Latonia in CE 638 circled an area that's two inches.
You've said that detective Day spotted a print on the side of the barrel about 3 inches to the rear of the front of the wooden stock. Of course we can assume that this three inches would be the middle of the 3/4 inch print. ( IOW the front of the print would be about 3/8 of an inch forward of that mid point , Or about 2 5/8 inches from the front of the wooden stock .
So now we have the front of the print about 2 5/8" from the front of the wooden stock. And we have the rear of the bayonet lug about 3/4 inch to the rear of the front of the wooden stock ----which means that there was a gap between the front of the "palm "print and the rear of the bayonet lug of---- 1 3/4 inches.
Since you believe that the tape used to lift the print was 1 1/2 inches wide ......the distance from the back of the lug to the print should be roughly the same as the width of the tape in the palm print photo. Is that distance the same as the width of the tape??
In your above estimate the distance would be 7/8 " ---- 1 1/8 "