Do you have another Sub or Function called xlFillList ? That appears to be missing in the code you posted.

If you don't have that macro, you could try a more direct method, assuming the userform is contained in the workbook where the data is sitting.

Me.CaliberComboBox.RowSource="Sheet1!A110"
or
Me.CaliberComboBox.RowSource="Caliber"

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Andrew Lockton
Chrysalis Design, Melbourne Australia