Tin is excellent for metal lures, that's why they used it in the old days. One company here in NY, Charlie Graves tins, still uses it for their "tins" The only drawbacks, if you can call it that, is that the mold needs to be a little hotter because tin melts/hardens at a higher temp than lead, and the mold could clog and give you half a lure the first couple pours until the mold gets hot. And if you are doing really deep jigging for say lake trout, tin sinks slower, but once down there the lure has better action.
