I'm creating a template in which a user can copy & paste their records and
format it a certain way w/a macro button. One portion of the macro should
create a named range for all records that appear in column J, starting at J4.
However, as you can see from my code the marco is always going to name
whatever is in between J4:J748 (this is how many records are in the document
I am working with).

I can't figure out how to fix it - any suggestions appreciated.

Range("J4").Select
Range(Selection, Selection.End(xlDown)).Select
ActiveWorkbook.Names.Add Name:="Records2", RefersToR1C1:= _
"=Sheet1!R4C10:R748C10"
Range("C1").Select