I was off a bit when I said that the Mosin Nagants iron sights are factory set for 300 yards, its 300 meters according to this article.

http://www.thetruthaboutguns.com/201...ant-9130-pt-3/

From the article:

Although some 91/30s were sighted in at 100 meters, most were zeroed at the factory or arsenal for the expected battle distance of 300 meters.