Not all stocks with lead in them are going to crack from being filled.
Might be tin instead of lead.
That was commonly used in place of lead to avoid the problem of oxidation and cracking of the wood.
I sometimes wondered if some of the plugs I've seen weren't a high ratio tin to lead mix as they seemed to have oxidized a bit,,turned dull grey,, but never had gone wild like some and 'grown' to split the wood or butt plate.
The Win M12 3" Heavy Duck Gun has a large 'lead' plug under the pad. I wonder what they used. Those plugs always seem to be fairly shiny and w/o oxidation dispite their age and probable marsh and field use.
