I got my two $58 clearance thumbhole stocks from Stockys and they look quite nice. They are unfinished and I have started to prep one of the stocks for a barrel action from a rifle in another stock. Since this will rifle/stock set-up will be for shooting prairie dogs from off the bench I would like to make it heavier. The donor action is a single shot and the stock has a blind magazine plus the area underneath the barrel channel has a slot milled out. I would like to fill these areas with some material to add weight. My first thought was to melt and add lead but I see the melting point is 621.5 f. and thought this would burn the stock. You guys know what material is used to add weight to stocks.