+/- 3700 gramm, barrel diameter at the muzzle 17,5mm
my rifle number 1347 proofed in 1931 and your's 3511 proofed one year later I think this could not mean the numbering was only for this special Mauser hunting rifle if in 9,3mm or 10,75mm. if at least 3511 rifles were made they must have been around in masses.