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I thought wheel weights were generally a little harder than lino?
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Wheel weights are generally soft, but contain Arsenic and Antimony which allows them to be heat treated to nearly the harness of Linotype.
Wheel Weights are still the most available source of lead in most of the country inasmuch as salvage yards still have (and will have as long as old cars have them on their wheels), lead wheel weights despite the movement to non-lead (steel, zinc).
Many areas have little-no source for Linotype and rely on Wheel Weights plus a little tin for all our bullet casting. When Linotype is found, it is pounced upon by casters like a duck on a June bug.
http://home.earthlink.net/~potomac008/Lead%20Alloys.htm (bullet alloy composition: Copyright 2001 2009- 13th Confederate Infantry)
http://castboolits.gunloads.com/showthread.php?t=42016 (Bullet alloys: castboolit.gunloads.com forum)