I have used linotype and it will polish out very well (at least the stuff I have will) and, like Crowbarforge, haunt the thrift shops for "pewter". Most of the time it is really Britannia metal which contains tin, antimony and copper. I prefer the Britannia metal when pouring knife bolsters as there is no lead to cause problems when the knife is used around foods. Linotype does contain some proportion of lead and I just don't bother with it anymore. BTW, when you cut up a "pewter" mug or other thin item, save some strips to use in soldering up pin holes in your casting.
J.B.