For Sniders, minie type bullets are supposed to be pure lead (or close to it). These are sub-bore and need to be soft to bump up and fill the rifling. Most current Snider shooters who get serious about accuracy are using 0.60" solid grease groove bullets. Since these are already nearly groove diameter I'm not sure pure lead is the best although that's what most guys I know do use. Due to time problems I once bought a supply of cast 0.60" bullets which seemed to have a bit of tin in them- probably because it helps casting good slugs easily. These gave me the best accuracy I've had yet with the Snider. Must borrow a hardness tester and see what they actually test at.
milsurpo
Where are you getting your "pure" lead? Tin is needed to flow into the molds, I asked this very question of a buddy of mine who I spent the day casting, he has done this for many years now. Tin is in most soft lead already as the lead has to be formed in to something. Probably best to try getting your mold hot and testing the bullets, see what they look like. If you are not getting flow in to the molds you can get plumbers solder and add that to the lead to alloy some tin in to it and get better flow. I did not have to do this using catfish weights and lead from stain glass windows, so your lead may work fine as is.
The lead I have now is cable shielding, I want to turn it in to ingots to get some of the impurities out before going further but will test as I go to see how much it flows.
Scored a 5 gallon pail full of dead soft lead![]()
Adding tin to lead is like using soap to do the dish's. It makes the lead flow better to fill.
Easiest place to get tin nowadays is lead free solder. It's 99% tin