Bruce, a Gian Shrum 28 Mo was in Warren Co. 1850 census, and is apparently the one in Bates Co. 1860 census written as "Geo Shrain or Shram" 37 Mo with a wife Olivia J. 27:

Here's a couple of RootsWeb posts that support above:

http://boards.ancestry.co.uk/thread.aspx?mv=flat&m=26&p=surnames.schrum

http://boards.ancestry.com/topics.Military.united-20-states.civwar.general/2491/mb.ashx?pnt=1