Keebo, as Alan has touched on, there is a huge variation in bore size in the Moisin-Nagants. They can run as tight as the .308 he mentioned to at least as loose as .314. To know what you are dealing with, drive a buckshot or lead sinker through the bore and measure it. A thou off either way from bullet size makes little difference with jacketed bullets, but you could be dealing with one of the extremes.
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