The preferred way to apply the left indent is to apply a table style since this is part of the table style and shouldn't be locally set. The second macro shows how to change the relevant attributes of your chosen table style if they weren't already correctly set.
Code:
Sub TablesResizeAll()
Dim oTbl As Table
For Each oTbl In ActiveDocument.Tables
oTbl.AutoFitBehavior wdAutoFitFixed
oTbl.PreferredWidthType = wdPreferredWidthPoints
oTbl.PreferredWidth = InchesToPoints(7.2)
oTbl.Style = "Table Grid" 'also turns header row, 1st column & banded rows on
Next oTbl
End Sub
Sub SetupTableStyle()
With ActiveDocument.Styles("Table Grid").Table
.Alignment = wdAlignRowLeft
.LeftIndent = InchesToPoints(0.3)
End With
End Sub