Just to get started I would go with the above. A good source for tin is lead free solder. I get this at yard sales and have never paid over 50 cents for a roll. My Marlin 30-30 loves the Lyman 311041 and I use 50/50 wheel weights and lead, air cooled and aged 4 weeks. Have taken numerous deer with this boolit and alloy. I do add about 1 1/2 % tin to my alloy. If you need some wheel weights I could help you out until you start shopping. If interested send me a PM.
Larry