If you are really that interested in making specific alloys get a large batch of wheel weights melt them down and have a sample analysed by a analytical lab probably cost about $75 -100. Adjust tin with solder.
Antimony is just for hardness but without any tin will foul the bore like you wouldnt believe. There are plenty of alloy mix recipies around and also bullet hardness comparitors but generally a mix of just wheel weights, lead and a bit of solder works for me.
As to testing hardness simplest way is to put 2 bullets nose to nose in a vice if the both mash up the same they're the same hardness.
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