Josmund

I did basically the same thing... I filled a zip lock bag with some lead shot. Put that in the hollow stock. I tried different amounts until I got the feel I wanted.

Then I removed the bag and filled it with silicone caulk - zipped the bag shut squeezed the shot and silicone to get them mixed together - pushed the bag into the stock and let it dry. It form fit to the stock plus iwas able to remove it anytime I wanted.

Side benefit the stock is not a drum anymore...