This may not help answer your question directly but is something I have found useful when trying to work with dynamic ranges that may help you out.
Suppose in your worksheet you have the numbers 100 to 108 in cells A1:C3:
A B C
1 100 101 102
2 103 104 105
3 106 107 108
Then to select all the cells you can use the CurrentRegion
property:
Sub SelectRange()
Dim dynamicRange As Range
Set dynamicRange = Range("A1").CurrentRegion
End Sub
The advantage of this is that if you add new rows or columns to your block of numbers (e.g. 109, 110, 111) then the CurrentRegion will always reference the enlarged range (in this case A1:C4).
I have used CurrentRegion quite a bit in my VBA code and find it is most useful when working with dynmacially sized ranges. Also it avoids having to hard code ranges in your code.
As a final note, in my code you will see that I used A1 as the reference cell for CurrentRegion. It will also work no matter which cell you reference (try: replacing A1 with B2 for example). The reason is that CurrentRegion will select all contiguous cells based on the reference cell.