Use this:
Range("A1").ColumnWidth = ...
The units for this value are as follows:
The unit of column width is equal to the width of one character in the standard style. For proportional fonts, the character width is 0 (zero).
For example, the column width for the newly opened Excel file with default styles is 8.43 , which is 64 pixels.
... or is this the value of the auto-tuning width:
Range("A1").EntireColumn.AutoFit
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