I don't know why I'm receiving different counts:
This query gives me a count of 16 records that are over 300
Select p.doc,
COUNT(distinct CASE WHEN Datediff(DAY, filedate, Getdate()) > 250 THEN clms END) AS [250],
COUNT(distinct CASE WHEN Datediff(DAY, filedate, Getdate()) > 300 THEN...