What happened?

[Defcon-One]

I think you panicked! Probably not Zinc. I'm gonna go with the guys in the know:

What RickinTN, cbrick, GaryN, badbobgerman and geargasher said!!!!!

I think you have your answer. Flux with Pine Sawdust, Temp a bit lower and use a thermometer. You want control, you gotta take control!

DC-1

PS: My favorte quote of the month, "Ahh, preemptive refusal." - PbHurler!

[GP100man]

I would flux it well pour it into ingots , then use those to sweeten another alloy .

Hi tin content turned mine grey once& as you was at too hi a temp & casting like mad.

[KYCaster]

i mixed 5lbs of National Lead marked 777 with 5 lbs of Lino with 1/4 a lb of Tin

I'm sure someone will correct me if I'm wrong, but...............National Lead 777, isn't that 40/60 wiping solder?

If that's true, your alloy is well over 20% Sn. At 750 degF, you're about 300 deg. over melting temp.

That could explain the frosting.

Jerry

[onesonek]

Me thinks Gear is right.

Rick

Well said, my thoughts too.

[lwknight]

If it is correct hat the 777 is wiping solder you should be casting nice shiny ( tin wasting) bullets @ 540 degrees.
Anyway, a mold too hot will make frosty regardless of pot temp.

[badbob454]

also frosted bullets will hold the lube better just not as pretty / if 777 is high in tin as stated above ... add more lead to the mix low or slow the casting temp or timing , this will result in shiny pretty boolits

[Arctic Blues]

I use a cheapo infrared digital thermometer from harbor freight.
I am sure there are more accurate thermometers out there however,
I can't afford text book alloy.
I use it as a reference only.

Kinda a general rule of thumb type of deal.