Ordnance Corp USA Published Manual for Soviet Mosin-Nagant 1891, 1910, 1891-30, 1938 & 1944 Rifles, Carabines and Sniper Rifles in 1954, it's now in the Public Domain and available for download as a PDF or Kindle file
PDF Version
Kindle Version
There is some great information in this book
Seeya
Mark