Back in the day (the '70's) I built the 7000# keel for my sailboat using primarily clip-on wheelweights scrounged from tire dealers. That avenue has largely dried up. About two years back I purchased over 800# of clip-on wheelweights (stay away from stick-ons ... too soft) by watching the classifieds on the castboolits.gunloads.com website. Veril Smith of LBT fame suggested adding about 1 - 2% tin and about 10% lead shot by weight to the mix. This gives me consistent bullet hardness of 15 - 16 BHN when air cooled. If you are serious about this hobby and intend to use scrounged lead, you need a hardness tester. I have also had good luck casting for my '9's and '40 using water dropped range lead. My testing of range lead has been limited to about four sources of range lead and I found the product varied far more than my cast-on wheelweight purchases ... probably a function of raw material source.
