Thank you! It's a 30-06 M1917 and not a .303 calibre P-14.
I've no intention of building one and don't have a Warner & Swasey sight. It was the epiphany that the P14 with Warner & Swasey is the one sniper rifle that was not discussed in Chapter 13. I missed my chance on paying only $7.50 for the W&S because I wasn't born yet in 1939 when ads appeared in the American Rifleman magazine. I'll have to join Jouster's site and ask for permission to reproduce the images.
The K98kswept-back scope mount in the book was a photograph of a replica, but at least the text said it was for illustrative purposes as the original (hidden somewhere in the US Army's collection) couldn't be located at the time.