Creating a dynamic chart in Excel VBA using macro and .End function

Question

I'm trying to make a dynamic chart based on the last row and column. The problem occurs when I have to define the Chart range. It identifies both the last row and column but when I try to set the chart range the last column is equal to the full spreadsheet.

Code:

Sub Spiderweb_test()
'
'Spiderweb_test Macro
    Dim chtObj As ChartObject

    lr = ActiveSheet.Cells(Rows.Count, 1).End(xlUp).Row
    lc = ActiveSheet.Cells(4, Columns.Count).End(xlToLeft).Column

    Set chtRng = Range("A4:lc" & lr)
    Set ChartArea = Range("a" & lr + 3 & ":f" & lr + 15)

    ActiveSheet.Shapes.AddChart2(317, xlRadarMarkers).Select
    ActiveChart.SetSourceData Source:=chtRng

    Set chtObj = ActiveChart.Parent
    chtObj.Top = ChartArea.Top
    chtObj.Left = ChartArea.Left
    chtObj.Height = ChartArea.Height
    chtObj.Width = ChartArea.Width
End Sub

Picture of output:

Answer 1

Use:

Set chtRng = Range(Cells(4, 1), Cells(lr, lc))

Since lc is actually the number of the column, not the letter. Hence the Chart Range is not being set correctly.