My rule of thumb is pure lead (or almost pure), soft--round balls, mini/Maxi balls, low speed pistol bullets, shot gun slugs. Relatively slow speeds, to 1000 fps.
Wheel weights /linotype, may have tin, antimony or other metals, for a harder alloy.
Pistol, and slower rifle, bullets, up to about 1600fps, faster up to 2000 fps, gas checks/paper patching, help with barrel leading.
This may be argued by some, but it's what I use.
There is a lot more to it than this, so if you want to start casting bullets, need to study up on alloys, speeds, heat treating, gas checking, paper patching as well as mold/bullets, melt/pour temps, types of bullets etc.
And if unsure of alloy, Brinell hardness testing is a good idea, and will tell you what you have and what you can use it for.
http://www.surplusrifle.com/shooting...ness/index.asp
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