Adding weight to rifle length buffers

[NoOne]

In addition to an extra power recoil spring, would replacing one or two of the steel buffer weights with high density tungsten weights in a rifle length buffer have any beneficial effect such as additional recoil reduction? Has anyone tried this?

Along the same topic, where could tungsten weights be purchased without having to buy a complete buffer? I would rather not have extra buffers around if I can avoid it. Using machinist stamps, or engraving tools to indicate which buffers have added weights would be an easy task.