khansen97,
Width is a read-only property of the range. It is returned in points.
ColumnWidth is a read/write property of the range. It is the number of standard width characters (like a 0) in the normal style that will fit.
As a fine point, Width can be added up for several columns and the results are the same as a single column having the same apparent (by eye) width. The same cannot be said for the sum of ColumnWidth, which will be a little less than for a single column having the same apparent width.
Brad