I am looking for rifle data books as would have been standard issue for the M1 Garand and the M14. Google has been less than stellar in this search. Any ideas?
For standard US military issue rifle data books, search on "combination scorebook us rifle m1" ... you should find several links to what was issued in and around 1942. The copy I bought off eBay is dated 19 June 1943, and carries the notation W.D., A.G.O. Form No. 82. You can find many original issue rifle data books from all our military branches and from all eras for sale on eBay.
For more modern versions, x10 provides a good link.
I would head over to the civilan marksmanship program website ,a lot of this can be found over there,but the blue service rifle guide to marksmanship is worth buying if you can it