Lyman listed loads using WSF as did Winchester back when it first came out. A couple years later, Winchester pulled their data a couple years later after further testing showed unpredictable and high pressure spikes. Lyman left their data in subsequent printings.
I used WSF for 28 ga until I learned Winchester pulled the data. If the manufacturer found iserious issue with their own components and pulled the data, I figure it would be unwise to ignore them.
