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I don't think there is a 99.3% tin solder usual solder is 50/50 60/40 70/30
have you seen the product if it is in ingot form it will be marked to what it is
the price seems to low,

195 gram for 50/50

Depends on who you buy it from I pay $13.00 + gst from an engineering supply shop retail is probable double that.

https://www.dlm.co.nz/
Wait until you see the price I think they will make the mix to your spec,
The price is very high if you plan on selling bullets virgin metal is way too expensive
your...