20 parts lead to 1 part tin?

[cajun47]

http://www.midwayusa.com/ebrowse.ex..._source=leadalloy&utm_medium=bulletcastingcat

is this required for casting 9mm bullets? i have some lead i found but have no idea if it has tin. what the purpose of the 1 part tin? will i harm my barrel without it?

 

[100W_Warlock]

Tin makes the alloy flow easier

Tin has two properties.

Lowers the melting point and reduces surface tension, just a bit. It makes the alloy easier to fill in the groves, as it were.

Antimony has much of the same properties.

Casting at a higher temp will also help.


a 25lb bag of magnum shot and a 1lb roll of 50/50 solder (tin:lead) will make fantastic alloy for casting 9mm bullets and other 38cal calibers.

 

[crowbeaner]

My usual mix is 18 lbs. WW metal and 2 lbs. of 50/50 solder. I bought quite a lot of solder years ago and got a really good price from a plumbing contractor. With the price of shot going through the roof lately, I'd try the WW mix. The local Goose Hill store is charging 36.99 a bag for Lawrence Magnum shot[we looked last Wed.]. OUCH!