http://www.popularmechanics.com/military/weapons/a19053/the-army-want-some-silver-bullets/

"a new form of nanostructured silver that is as strong as steel. Metals have a crystalline structure, and the size and arrangement of these crystals affect the strength of the finished article. According to the Army, normal silver has a yield strength of 50-150 Mpa (megapascals), where nanostructured silver will have a yield strength of 250-500 Mpa. Their requirement is for silver with a strength of 300 Mpa. (For comparison, the A36 steel commonly used in the construction industry has a yield strength of 215 Mpa)."