Lots of incorrect info in your article . S ammo did not start in 1905 , there are headstamp dates way before that , and the dates on the German military testing . The S ammo was designed to be fired in the original Gew-88 rifle , that is why it had a .321 dia bullet to be fired in the original .321 groove bore . The 88/05 modifications were for stripper clip loading only , it had nothing to do with the S ammo . The new 05 sight was still set for the old P-88 ammo . That is why they were ground down to be modified later for the S ammo settings . Just look at an original unmodified 88/05 . The throat of the chamber was not touched was it was already 3x the size needed for the much shorter S bullet . All the s stamp means is the rifle was clear to use S ammo as there was only a .002 difference between the first .3188 bullet and the later .3208 bullet . About every military rifle made had more than .002 clearance . All if this is easy to see if you have original ammo , rifles and documents .
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