|30-30 chamber casting (top) and 30-30 shell (bottom).|
I got a little curious about this material so I did a little reading and found there are a whole bunch of different metallic mixtures that have relatively low melting points. Wikipedia has a chart. Reading over this chart it appears that only a handful of elements are used in any of these alloys. Well, this is just crying out for further analysis, so I transport their data into my own spreadsheet and mung it around, and presto, we have a new table. Not sure whether it tells us anything significant, but at least the similarities and differences between the various alloys can be easily seen.