Pewter made today is different that the old pewter made in the 18 and 19th centuries. The old stuff had lots of lead in it. Today's pewter has zinc in it, and no lead.
For a nose cap, you would be better served buying something like Cerrosafe, from Track of the Wolf, for instance. This melts at about 160 degrees, so its much safer to be around, and it does not burn the wood( flashpoint of wood is 451 Degrees F.) That makes casting, or recasting a nosecap much safer, and avoids the problem of starting fires. You don't want to have to use water around any kind of molten metal.