Don't say pewter (which is why I was reluctant to pick up at $2 each) but the one I did purchase melted like high tin content metal when I put a propane torch to one corner. Tin melts at a much lower temp than lead and this stuff started to flow in a second or so when hit with a propane torch.
Can't say how it casts have not tried it yet. Hopefully someone that has can provide some info on how much picture frame they added to the pot recipe to get good results.